CVEvulnerability
CVE-2026-74986
9.1 CRITICAL
Official page ↗
- Status
- Analyzed
- Published
- 2026-08-18
- Last modified
- 2026-08-25
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weaknesses
- CWE-200
Description
Site isolation issue in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Affected configurations
• mozilla firefox (< 153.1.0)
• mozilla thunderbird (< 153.1.0)
Related
Weakness · CWE (1)
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2060048 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-74/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-77/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-78/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-80/ Vendor Advisory