Patch Analysis & Exploitation Timeline: Three CVEs, One Deadline, CISA's September 16, 2026 KEV Additions for Google Pixel, Cisco ISE, and Acronis Backup
An analysis of three vulnerabilities added to CISA’s Known Exploited Vulnerabilities Catalog on September 16, 2026, covering Google Pixel, Cisco Identity Services Engine, and Acronis Backup, including their technical impact, vulnerability classifications, and three-day remediation deadlines.
Analysis of three vulnerabilities added to the CISA Known Exploited Vulnerabilities catalog on September 16, 2026, including their remediation deadlines, vulnerability classifications, affected technologies, and organizational response considerations.
Dataset Summary
| Field | Value | Interpretation |
|---|---|---|
| Reporting Date | September 16, 2026 | Date on which the three vulnerabilities were added to the CISA KEV catalog. |
| Total CVEs Analyzed | 3 CVEs | Three vulnerability records were included in the dataset. |
| Affected Vendors | Google, Cisco, and Acronis | Three vendors are represented. |
| Products Affected | Google Pixel, Cisco Identity Services Engine, and Acronis Backup | Mobile devices, network identity infrastructure, and backup integrations. |
| KEV Inclusion Date | September 16, 2026 | Date all three vulnerabilities were added to the CISA KEV catalog. |
| CISA Remediation Due Date | September 19, 2026 | Assigned remediation deadline for all three records. |
| Average KEV Remediation Window | 3 calendar days | Average of the three identical inclusion-to-deadline intervals. |
| Median KEV Remediation Window | 3 calendar days | Middle value of the three remediation-window observations. |
| Shortest KEV Remediation Window | 3 calendar days | Minimum observed interval. |
| Longest KEV Remediation Window | 3 calendar days | Maximum observed interval. |
| Known Ransomware Campaign Use | Unknown for all three records | The supplied records do not confirm known ransomware campaign use. |
| Forensic Triage | Yes for all three records | Organizations should evaluate whether investigation is required in addition to remediation. |
Sourcing and Methodology
This analysis is based primarily on the CISA Known Exploited Vulnerabilities (KEV) catalog and the source references associated with each record. CISA maintains the KEV catalog as a public resource identifying vulnerabilities with evidence of exploitation in the wild. The catalog can be used as an input to organizational vulnerability management and remediation prioritization.
The supplied records include vendor advisories, product-specific security bulletins, NVD references, and CISA guidance links. These sources provide technical context for the affected products, vulnerability types, remediation requirements, and forensic-triage expectations.
- CISA KEV Catalog: Used to identify the vulnerabilities, KEV inclusion dates, remediation due dates, required actions, and forensic-triage flags.
- Google Pixel Security Bulletin: Used as the vendor reference for CVE-2026-58704 and the affected Google Pixel platform.
- Cisco Security Advisory: Used as the vendor reference for CVE-2026-76460 affecting Cisco Identity Services Engine and Cisco ISE Passive Identity Connector.
- Acronis Security Advisory: Used as the vendor reference for CVE-2026-87886 affecting Acronis Backup integrations for cPanel & WHM and Plesk.
- NVD References: Included as supporting vulnerability references for the individual CVE records.
- CISA BOD 26-04 Guidance: Provides the operational context for prioritizing security updates based on risk.
- CISA Forensics Triage Requirements: Provides guidance for determining whether forensic investigation may be required in addition to patching.
The remediation-window calculations in this article use calendar-day
differences between the CISA dateAdded and
dueDate fields. The calculated interval does not represent
the time between vulnerability disclosure and patch availability, nor
does it represent the time between patch availability and exploitation.
Introduction
On September 16, 2026, the CISA Known Exploited Vulnerabilities (KEV) catalog recorded three vulnerabilities affecting Google Pixel, Cisco Identity Services Engine, and Acronis Backup. The vulnerabilities are represented by CVE-2026-58704, CVE-2026-76460, and CVE-2026-87886.
All three vulnerabilities were assigned a CISA remediation deadline of September 19, 2026. Based on the CISA KEV inclusion date of September 16 and the due date of September 19, each vulnerability has a three-calendar-day KEV inclusion-to-remediation window.
This analysis focuses on the operational remediation window established by the CISA KEV catalog. The KEV inclusion-to-remediation interval is treated separately from the original disclosure-to-patch gap and the patch-to-exploitation gap because those measurements require vendor release dates, public disclosure dates, and confirmed exploitation timestamps that are not consistently included in the supplied dataset.
Background and Context
The CISA KEV catalog identifies vulnerabilities for which there is evidence of exploitation in the wild. Inclusion in the catalog provides an operational signal that organizations should evaluate exposure and prioritize remediation.
A remediation deadline is different from a vulnerability's disclosure date, patch-release date, or first exploitation date. The CISA deadline represents a required or recommended operational target under the applicable guidance. It should not be interpreted as an estimate of how long attackers will wait before exploiting a vulnerability.
The three vulnerabilities in this dataset affect different types of enterprise and consumer technology:
- Google Pixel: Mobile devices using a cellular modem that may be affected by an improper authorization issue.
- Cisco Identity Services Engine: Network identity and access infrastructure that may be affected by incorrect use of privileged APIs.
- Acronis Backup: Backup-management integrations for cPanel & WHM and Plesk that may be affected by incorrect default permissions.
Because the records cover different platforms and vulnerability classes, remediation decisions should consider asset exposure, business criticality, privilege impact, network accessibility, software deployment, and the presence of suspicious activity.
Gap Calculation Methodology
Vulnerability lifecycle metrics must be calculated using dates that correspond to the same type of event. The CISA KEV inclusion date and remediation due date are available for all three records. However, the supplied dataset does not consistently provide original public disclosure dates, vendor patch-release dates, or exact first-exploitation dates.
KEV Inclusion-to-Remediation Window
The measurable operational window is calculated using the following formula:
KEV Inclusion-to-Remediation Window = CISA Due Date − KEV Inclusion Date
For all three records:
September 19, 2026 − September 16, 2026 = 3 calendar days
Disclosure-to-Patch Gap
The disclosure-to-patch gap is calculated using the following formula:
Disclosure-to-Patch Gap = Patch Availability Date − Public Disclosure Date
The supplied CISA records do not provide a consistent original public disclosure date or vendor patch-availability date for all three vulnerabilities. Therefore, an independent disclosure-to-patch gap is not calculated in this analysis.
Patch-to-Exploitation Gap
The patch-to-exploitation gap is calculated using the following formula:
Patch-to-Exploitation Gap = First Confirmed Exploitation Date − Patch Availability Date
The supplied records identify the vulnerabilities as CISA KEV entries, indicating known exploitation, but they do not provide an exact, independently confirmed first-exploitation date and time. Therefore, the patch-to-exploitation gap cannot be calculated precisely for these records.
Missing or ambiguous dates are not estimated or replaced with assumed values. The analysis instead reports the measurable CISA inclusion-to-remediation window and clearly distinguishes it from the unavailable lifecycle intervals.
Patch Timeline & Exploitation Gap Analysis
The September 16, 2026 dataset contains three CISA KEV vulnerabilities. Each record was added to the catalog on September 16, 2026 and assigned a remediation deadline of September 19, 2026. Consequently, all three vulnerabilities have an identical three-calendar-day KEV inclusion-to-remediation window.
| Metric | Result |
|---|---|
| Total Vulnerabilities Analyzed | 3 |
| Average KEV Remediation Window | 3 calendar days |
| Median KEV Remediation Window | 3 calendar days |
| Shortest KEV Remediation Window | 3 calendar days |
| Longest KEV Remediation Window | 3 calendar days |
| Window Variation | No variation; all records have the same interval |
Remediation Window Overview
The three-day interval represents the time between CISA KEV inclusion and the assigned remediation deadline. It should be interpreted as an operational remediation target rather than as a disclosure-to-patch or patch-to-exploitation measurement.
Although the remediation windows are identical, the vulnerabilities differ in affected platforms, vulnerability classes, and potential security impact. Therefore, the same deadline does not necessarily imply that the operational response for each asset will be identical.
Remediation Window by CVE
| CVE ID | Vendor | Product | KEV Added Date | Due Date | Remediation Window |
|---|---|---|---|---|---|
| CVE-2026-58704 | Pixel | September 16, 2026 | September 19, 2026 | 3 calendar days | |
| CVE-2026-76460 | Cisco | Identity Services Engine | September 16, 2026 | September 19, 2026 | 3 calendar days |
| CVE-2026-87886 | Acronis | Backup | September 16, 2026 | September 19, 2026 | 3 calendar days |
Exploitation-Gap Data Availability
The dataset confirms that all three vulnerabilities were included in the CISA KEV catalog, but it does not provide consistent public disclosure dates, patch-release dates, or exact first-exploitation timestamps. As a result, the disclosure-to-patch and patch-to-exploitation gaps cannot be calculated precisely.
The measurable result in this dataset is therefore the common three-calendar-day KEV inclusion-to-remediation window. This metric should not be interpreted as the time attackers had available before exploitation or as the period between patch release and exploitation.
CVE Timeline Data
The following table presents the per-CVE data available in the supplied dataset. The KEV inclusion and remediation dates are available for all three records. Original disclosure dates, vendor patch-release dates, and exact first-exploitation timestamps are not included consistently, so they are not estimated.
| CVE ID | Vendor | Product | Disclosure Date | Patch Available | KEV Added | Due Date | Patch-to-Exploitation Gap |
|---|---|---|---|---|---|---|---|
| CVE-2026-58704 | Pixel | Unavailable in supplied dataset | Unavailable in supplied dataset | September 16, 2026 | September 19, 2026 | Not precisely calculable | |
| CVE-2026-76460 | Cisco | Identity Services Engine | Unavailable in supplied dataset | Unavailable in supplied dataset | September 16, 2026 | September 19, 2026 | Not precisely calculable |
| CVE-2026-87886 | Acronis | Backup | Unavailable in supplied dataset | Unavailable in supplied dataset | September 16, 2026 | September 19, 2026 | Not precisely calculable |
Common KEV inclusion date: September 16, 2026
Common CISA remediation deadline: September 19, 2026
Common KEV inclusion-to-remediation window: 3 calendar days
Statistical Distribution and Outliers
The dataset contains three observations, and each vulnerability has a three-calendar-day KEV inclusion-to-remediation window.
| Statistical Measure | Result |
|---|---|
| Number of Observations | 3 |
| Average | 3 days |
| Median | 3 days |
| Minimum | 3 days |
| Maximum | 3 days |
| Range | 0 days |
| Observed Variation | None |
| Outliers | None observed |
The average, median, minimum, and maximum are identical because all three records were assigned the same CISA remediation interval. The zero-day range indicates no variation within this particular dataset. No outlier is observed because every record has the same three-day interval.
These results should not be interpreted as evidence that all CISA KEV vulnerabilities receive a three-day remediation window. The sample contains only three records from one reporting date.
Vulnerability Class Breakdown
The three vulnerabilities belong to different vulnerability classes. This provides a basic category-level view of the dataset, although the sample is too small to establish broad statistical conclusions about vulnerability classes.
| CVE ID | Vulnerability Class | CWE | Affected Product | Potential Impact |
|---|---|---|---|---|
| CVE-2026-58704 | Improper Authorization | CWE-285 | Google Pixel | Permission-check bypass and potential privilege escalation |
| CVE-2026-76460 | Incorrect Use of Privileged APIs | CWE-648 | Cisco Identity Services Engine | Unauthorized access through the web-based management interface |
| CVE-2026-87886 | Incorrect Default Permissions | CWE-276 | Acronis Backup | Potential privilege escalation |
CVE-2026-58704:Google Pixel
CVE-2026-58704 affects Google Pixel devices and is described as an improper authorization vulnerability in the cellular modem. A logic error may allow an attacker to bypass permission checks and escalate privileges.
The vulnerability is classified under CWE-285:Improper Authorization. The affected component is the cellular modem, making the issue relevant to devices that use the affected Pixel software and modem implementation.
The CISA record marks forensic triage as required for consideration. Organizations should evaluate affected devices, confirm the applicable vendor security update, and investigate unusual device behavior where compromise is suspected.
CVE-2026-76460:Cisco Identity Services Engine
CVE-2026-76460 affects Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC). The vulnerability involves the incorrect use of privileged APIs and could allow an unauthenticated, remote attacker to gain unauthorized access to the affected device by bypassing the web-based management interface.
The vulnerability is classified under CWE-648. Because Cisco ISE may support identity, authentication, authorization, and network-access-control functions, unauthorized access to the affected device may have broader infrastructure implications.
The CISA record marks forensic triage as required for consideration. Organizations should validate the affected ISE and ISE-PIC deployments, apply the vendor-recommended remediation, and review management-interface activity for suspicious access attempts.
CVE-2026-87886: Acronis Backup
CVE-2026-87886 affects the Acronis Backup plugin for cPanel & WHM and the Acronis Backup extension for Plesk. The vulnerability involves incorrect default permissions and could allow privilege escalation.
The vulnerability is classified under CWE-276. Since backup platforms may have access to sensitive data, system configurations, and administrative functions, privilege escalation within backup-management infrastructure may create additional security concerns.
The CISA record marks forensic triage as required for consideration. Organizations should identify affected backup integrations, verify permissions and deployment versions, apply the applicable vendor mitigation, and investigate unexpected privilege changes.
Notable Case Highlights
Google Pixel: Improper Authorization in the Cellular Modem
CVE-2026-58704 is notable because it affects the cellular modem component of Google Pixel devices. Improper authorization in a modem-related component may allow permission checks to be bypassed and could create a privilege-escalation risk. Organizations managing Pixel fleets should confirm affected device models, software versions, and applicable security updates.
Cisco ISE: Risk to Network Identity Infrastructure
CVE-2026-76460 affects Cisco Identity Services Engine and the Cisco ISE Passive Identity Connector. The affected technologies may support authentication, authorization, identity services, and network-access control. Unauthorized access to these systems may therefore have implications beyond an individual application and should be evaluated in the context of network-management exposure.
Acronis Backup: Privilege Escalation in Backup Integrations
CVE-2026-87886 affects Acronis Backup integrations for cPanel & WHM and Plesk. Incorrect default permissions may allow privilege escalation in environments that manage backup operations and sensitive data. Organizations should verify permissions, review administrative activity, and confirm that the affected integrations have been remediated.
Common Operational Deadline
All three vulnerabilities share the same CISA remediation deadline of September 19, 2026. The common deadline simplifies calendar tracking, but the remediation process should remain asset-specific because the vulnerabilities affect different products, components, deployment models, and attack surfaces.
Historical Trend Comparison
The current dataset contains three vulnerabilities added on the same date, all with the same remediation deadline. As a result, the dataset does not establish whether CISA remediation windows are widening, narrowing, or remaining stable over time.
A reliable historical trend analysis would require comparable data from earlier reporting periods using the same collection method and metric definitions. Future reporting periods could be compared using:
- Number of vulnerabilities added to the KEV catalog
- Average KEV inclusion-to-remediation window
- Median KEV inclusion-to-remediation window
- Minimum and maximum remediation windows
- Distribution by vendor and affected platform
- Distribution by vulnerability class and CWE
- Forensic-triage requirements
- Known ransomware campaign-use status
Maintaining consistent date definitions and filtering criteria will be necessary to ensure that future comparisons reflect actual differences rather than changes in methodology.
MITRE ATT&CK Mapping
A confirmed technique-level MITRE ATT&CK mapping is not established for the three records based solely on the supplied CISA data. The records describe vulnerability conditions and potential impacts but do not provide sufficient evidence about the exact attacker procedures, tools, commands, or post-exploitation behavior used in confirmed campaigns.
Potential command execution, privilege escalation, or unauthorized access does not by itself establish a specific observed MITRE ATT&CK technique. A reliable mapping would require additional technical evidence, such as exploit details, incident reports, malware behavior, command execution patterns, or documented attacker activity.
| Observed Data | MITRE ATT&CK Mapping Status |
|---|---|
| Improper authorization | No specific technique confirmed from the supplied data. |
| Privileged API misuse | No specific technique confirmed from the supplied data. |
| Incorrect default permissions | No specific technique confirmed from the supplied data. |
Risk Context for Organizations
The three vulnerabilities affect different types of systems and should be evaluated according to their deployment context, exposure, business role, and potential impact.
Google Pixel Risk Context
CVE-2026-58704 affects the cellular modem component of Google Pixel devices. An improper authorization issue that allows permission checks to be bypassed may create a privilege-escalation risk. Organizations managing Pixel devices should identify affected models and software versions and verify the availability and installation of the applicable Google security update.
Cisco ISE Risk Context
CVE-2026-76460 affects Cisco Identity Services Engine and Cisco ISE Passive Identity Connector. Because these systems may support identity and network-access-control functions, unauthorized access to the management interface may affect sensitive network-management operations.
Organizations should pay particular attention to deployments whose management interfaces are reachable from untrusted networks or are exposed through remote-access paths.
Acronis Backup Risk Context
CVE-2026-87886 affects Acronis Backup integrations for cPanel & WHM and Plesk. Incorrect default permissions may allow privilege escalation within backup-management environments. Because backup systems may process sensitive data and have elevated access, organizations should validate permissions and review unexpected administrative or privilege changes.
For all three vulnerabilities, the CISA forensic-triage flag indicates that organizations should consider investigation in addition to applying the available remediation.
Detection and Patch Prioritization Considerations
The three-day KEV remediation window should be treated as a prompt for immediate asset identification, exposure assessment, patching, and validation. Prioritization should not rely solely on the common deadline, because the affected technologies and attack surfaces differ.
- Identify affected assets: Locate all Google Pixel devices, Cisco ISE and ISE-PIC deployments, and Acronis Backup integrations for cPanel & WHM or Plesk.
- Confirm affected versions: Compare deployed versions and configurations against the applicable vendor security advisories and security bulletins.
- Assess exposure: Determine whether affected systems are exposed to untrusted networks, remote users, external interfaces, or other potentially hostile environments.
- Apply vendor remediation: Install the applicable security updates or apply the vendor-provided mitigations within the assigned remediation window.
- Review privileged activity: Investigate unexpected privilege changes, permission bypasses, unauthorized management-interface access, and unusual administrative operations.
- Review logs and indicators: Preserve and examine relevant device, network, application, identity, and backup-system logs where suspicious activity is identified.
- Perform forensic triage: Determine whether additional investigation is required based on asset exposure, suspicious events, and the organization's incident-response procedures.
- Validate remediation: Confirm that updates or mitigations were successfully applied and that the affected systems continue to operate securely.
- Continue monitoring: Track vendor advisories, CISA updates, exploitation reporting, and additional indicators of compromise.
The three-day period is a CISA KEV inclusion-to-remediation window. It should not be interpreted as evidence that organizations have three days from patch release before exploitation begins. The supplied records do not establish precise patch-to-exploitation intervals.
Key Takeaways
- Three vulnerabilities were added to the CISA KEV catalog on September 16, 2026.
- The affected vendors are Google, Cisco, and Acronis.
- The affected products are Google Pixel, Cisco Identity Services Engine, and Acronis Backup.
- All three vulnerabilities have a CISA remediation deadline of September 19, 2026.
- Each vulnerability has a three-calendar-day KEV inclusion-to-remediation window.
- The average, median, minimum, and maximum remediation windows are all three days.
- No variation or outlier exists in the remediation-window values within this three-record dataset.
- The records involve improper authorization, incorrect use of privileged APIs, and incorrect default permissions.
- CVE-2026-58704 is classified under CWE-285, Improper Authorization.
- The supplied data does not provide consistent disclosure, patch-release, or exact first-exploitation dates.
- Therefore, independent disclosure-to-patch and patch-to-exploitation gaps cannot be calculated precisely.
- All three records have the forensic-triage flag set to Yes, indicating that organizations should consider investigation in addition to patching.
- The three-record dataset is insufficient to establish broad historical trends or general conclusions about vulnerability classes.
Conclusion
The September 16, 2026 CISA KEV dataset contains three vulnerabilities affecting Google Pixel, Cisco Identity Services Engine, and Acronis Backup. Each vulnerability was added to the KEV catalog on September 16 and assigned a remediation deadline of September 19, producing a common three-calendar-day KEV inclusion-to-remediation window.
Although the remediation windows are identical, the vulnerabilities affect different platforms and represent different security concerns, including improper authorization, privileged API misuse, and incorrect default permissions. These differences should be considered when assessing exposure, business impact, patching priority, and the need for forensic investigation.
The available dataset supports calculation of the CISA operational remediation window but does not provide consistent dates for original disclosure, vendor patch availability, or exact first exploitation. Consequently, the KEV inclusion-to-remediation interval must not be presented as a substitute for disclosure-to-patch or patch-to-exploitation measurements.
Continued tracking of CISA KEV additions, vendor advisories, remediation deadlines, affected assets, exploitation reporting, and forensic indicators can provide a consistent foundation for vulnerability management, patch prioritization, incident response, and compliance monitoring.
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