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PatchSiren cyber security CVE debrief

CVE-2026-11267 Google CVE debrief

CVE-2026-11267 is a MEDIUM severity vulnerability in Google Chrome prior to 149.0.7827.53. The vulnerability is caused by insufficient policy enforcement in Extensions, which allowed an attacker who convinced a user to install a malicious extension to bypass content security policy via a crafted Chrome Extension. The Chromium security severity is rated as Low. The CVSS score is 4.3.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-07-23
Advisory published
2026-06-05
Advisory updated
2026-07-23

Who should care

Users of Google Chrome prior to version 149.0.7827.53, administrators of systems with Google Chrome installed, and security teams responsible for patching and vulnerability management.

Technical summary

The vulnerability is caused by insufficient policy enforcement in Extensions in Google Chrome prior to 149.0.7827.53. An attacker who convinces a user to install a malicious extension can bypass content security policy via a crafted Chrome Extension.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update Google Chrome to version 149.0.7827.53 or later.
  • Ensure that only trusted extensions are installed from the Chrome Web Store.
  • Monitor for suspicious extension activity and implement content security policy controls.

Evidence notes

The CVE record was obtained from the official CVE website. The vulnerability details were obtained from the NVD database and the Chrome Releases blog.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11267 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11267

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-11267 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11267

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.