Description
A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack. This vulnerability was fixed in Firefox 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mozilla Firefox
128.9 to ≤ 128.*unaffected137 to ≤ *unaffected
Mozilla Thunderbird
128.9 to ≤ 128.*unaffected137 to ≤ *unaffected
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1952213 ↗
- https://www.mozilla.org/security/advisories/mfsa2025-20/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-22/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-23/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-24/ ↗
- https://lists.debian.org/debian-lts-announce/2025/04/msg00005.html ↗