Description
A clickjacking vulnerability could have been used to trick a user into leaking saved payment card details to a malicious page. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Affected products
mozilla: firefox
References7
- www.mozilla.org/security/advisories/mfsa2025-42/ Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-44/ Vendor Advisory
- bugzilla.mozilla.org/show_bug.cgi?id=1954137 Permissions Required
- www.mozilla.org/security/advisories/mfsa2025-45/
- www.mozilla.org/security/advisories/mfsa2025-46/
- lists.debian.org/debian-lts-announce/2025/05/msg00043.html
- lists.debian.org/debian-lts-announce/2025/05/msg00046.html
Metrics
- CVSS 3.1
-
5.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 21 · as of 7 November 2026
- CWE
- CWE-1021
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.