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CVE-2026-11126 Google CVE debrief

CVE-2026-11126 is a Medium severity vulnerability in Google Chrome prior to version 149.0.7827.53. The vulnerability is caused by an inappropriate implementation in DevTools, which allowed an attacker who convinced a user to install a malicious extension to leak cross-origin data via a crafted Chrome Extension. The CVSS score for this vulnerability is 4.3.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-06-09
Advisory published
2026-06-04
Advisory updated
2026-06-09

Who should care

Users of Google Chrome prior to version 149.0.7827.53, and administrators of systems that use Google Chrome.

Technical summary

The vulnerability is caused by an inappropriate implementation in DevTools in Google Chrome prior to version 149.0.7827.53. This allowed an attacker who convinced a user to install a malicious extension to leak cross-origin data via a crafted Chrome Extension.

Defensive priority

Medium

Recommended defensive actions

  • Update Google Chrome to version 149.0.7827.53 or later.
  • Be cautious when installing extensions from untrusted sources.
  • Monitor for suspicious activity in Chrome DevTools.

Evidence notes

The CVE record was published on [resourceLinkAnnotations:cve-org] and the NVD detail can be found at [resourceLinkAnnotations:nvd].

Official resources

CVE-2026-11126 was published on 2026-06-04T23:17:18.570Z and modified on 2026-06-09T03:05:37.077Z.