CVE-2025-3859

Firefox Focus elide URL allows address bar spoofing

State: Published
Severity: 4.3 Medium
Published: Apr 30, 2025
Updated: Apr 13, 2026
Reserved: Apr 21, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N	CISA-ADP

Weaknesses

CWE-451 User Interface (UI) Misrepresentation of Critical Information

Affected Products

Product	Versions
FocusMozilla	138 and laterNot affected

References

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

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