Same-origin policy bypass in the Networking: JAR 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. May 19, 2026 · NIST NVD

   Detected

   Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

2. Jul 23, 2026 · NIST NVD

   Updated

   Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Affected

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

Sources

• CVE.orgVulnerability recordCVE-2026-8971

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-8971

  Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

  nvd.nist.gov

References

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