CVE-2026-113129 Google CVE debrief

Who should care

Defenders responsible for managing Google Chrome deployments, particularly those using Extensions, should assess exposure and apply patches. Roles include IT administrators, cybersecurity teams, and incident response personnel.

Why it matters

CVE-2026-113129 is a Medium-severity vulnerability in Google Chrome Extensions that could allow sensitive information disclosure. Defenders should verify and apply patches, monitor for suspicious activity, and enforce strict access controls.

• Potential sensitive information disclosure through crafted HTML pages.
• Need to verify and apply patches for Google Chrome to prevent exploitation.
• Possible impact on confidentiality if sensitive data is accessed.
• Requires monitoring for suspicious activity related to Chrome Extensions.

Technical summary

The vulnerability is due to improper access control in Google Chrome Extensions. This could allow a remote attacker to potentially leak sensitive information via a crafted HTML page. The issue was addressed in Google Chrome version 156.0.8078.47. The vulnerability affects Google Chrome prior to version 156.0.8078.47 and has a Medium security severity rating from Chromium. Defenders should verify and apply patches to prevent exploitation and monitor for suspicious activity related to Chrome Extensions. The vulnerability could potentially leak sensitive information through crafted HTML pages, impacting confidentiality.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the available patch for Google Chrome to version 156.0.8078.47 or later.
• Monitor for and restrict access to sensitive information that could be leaked through crafted HTML pages.
• Enforce strict access controls and input validation for web content in Chrome Extensions.
• Confirm whether affected Google Chrome deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

Official CVE and NVD records describe an improper access control vulnerability in Google Chrome Extensions prior to version 156.0.8078.47. Chromium rates this issue with a Medium security severity. The CVE record was published on 2026-10-20T21:02:06.185Z and has not been modified since then. The vulnerability was addressed in Google Chrome version 156.0.8078.47. Defenders should verify and apply patches, monitor for suspicious activity, and enforce strict access controls. The source-provided CVE metadata and NIST NVD detail page offer

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.