CVE-2025-3859

Firefox Focus elide URL allows address bar spoofing

CVSS 4.3 MEDIUMEPSS 0.2%CWE-451

Websites directing users to long URLs that caused eliding to occur in the location view could leverage the truncating behavior to potentially trick users into thinking they were on a different webpage. This vulnerability was fixed in Focus 138.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected products

Mozilla · Focus

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References

https://bugzilla.mozilla.org/show_bug.cgi?id=1951533 https://www.mozilla.org/security/advisories/mfsa2025-33/