CVEvulnerability
CVE-2026-84129
9.8 CRITICAL
Official page ↗
- Status
- Analyzed
- Published
- 2026-09-01
- Last modified
- 2026-09-03
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-346
Description
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
Affected configurations
• mozilla firefox (< 153.2.0)
• mozilla firefox (>= 154.0.0 < 155.0.0)
• mozilla thunderbird (< 153.2.0)
• mozilla thunderbird (>= 154.0 < 155.0)
Related
Weakness · CWE (1)
- CWE-346 Origin Validation Error weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2055028 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-82/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-85/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-86/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-88/ Vendor Advisory