URL Bar Spoofing via non-BMP Unicode characters
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.3epss 0.3%
exploitation probability
0.3%top 72% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1952213https://lists.debian.org/debian-lts-announce/2025/04/msg00005.htmlhttps://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/