Mitigation bypass in the DOM: postMessage component.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Apr 21, 2026 · NIST NVD

   Detected

   Mitigation bypass in the DOM: postMessage component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

2. Jun 17, 2026 · NIST NVD

   Updated

   Mitigation bypass in the DOM: postMessage component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Affected

• cpe mozilla/firefoxversion unspecified
• cpe mozilla/thunderbirdversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-6755

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-6755

  Mitigation bypass in the DOM: postMessage component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

  nvd.nist.gov

References

• Permissions Required · bugzilla.mozilla.org
• Vendor Advisory · mozilla.org
• Vendor Advisory · mozilla.org