CVE-2026-100803 PUBLISHED

Same-origin policy bypass in the WebExtensions component

Assigner: mozilla
Reserved: 26.09.2026 Published: 29.09.2026 Updated: 29.09.2026

Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Product Status

Vendor Mozilla
Product Firefox
Versions
  • unaffected from 115.42 to 115.* (incl.)
  • unaffected from 140.17 to 140.* (incl.)
  • unaffected from 153.4 to 153.* (incl.)
  • unaffected from 157 to * (incl.)

Credits

  • Yaqoub Aldurayhim

References