CVEvulnerability
CVE-2026-100803
8.1 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-09-29
- Last modified
- 2026-10-19
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-346
Description
Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Affected configurations
• mozilla firefox (< 115.42.0)
• mozilla firefox (>= 116.0 < 140.17.0)
• mozilla firefox (>= 141.0 < 153.4.0)
• mozilla firefox (>= 154.0.0 < 157.0.0)
• mozilla thunderbird (< 140.17.0)
• mozilla thunderbird (>= 141.0 < 153.4.0)
• mozilla thunderbird (>= 154.0 < 157.0)
Related
Weakness · CWE (1)
- CWE-346 Origin Validation Error weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2057988 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-100/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-101/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-102/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-103/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-97/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-98/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-99/ Vendor Advisory