By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application which implements that protocol handler is installed. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://www.mozilla.org/security/advisories/mfsa2024-46/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-47/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-49/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-50/ Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.3 · mozillaNVD modified 2026-10-08 15:37
Affected (CPE criteria) 9
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:129.0:beta:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:129.0:beta2:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:129.0:beta3:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:129.0:beta4:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:129.0:beta5:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:129.0:beta6:*:*:*:*:*:*
References 5
- https://bugzilla.mozilla.org/show_bug.cgi?id=1881037 Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2024-46/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-47/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-49/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-50/ Vendor Advisory