CVE-2025-3859

MEDIUM 4.3

Firefox Focus elide URL allows address bar spoofing

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	focus
Ecosystems	Browser JavaScript
Industries	Technology
Published	Apr 30, 2025
Last Updated	Apr 13, 2026

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Affected Versions

Mozilla / Focus

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

James Lee