{"id":"CVE-2025-3859","aliases":["EUVD-2025-12733","GHSA-4jh7-c2vv-7qf2"],"status":"published","title":"Firefox Focus elide URL allows address bar spoofing","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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00208,"percentile":0.1095,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-451","CWE-601"],"published":"2025-04-30T16:30:18Z","modified":"2026-06-17T09:20:49Z","products":[{"vendor":"mozilla","product":"firefox_focus"},{"vendor":"mozilla","product":"focus"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1951533","tags":["Issue Tracking"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-33/","tags":["Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-3859"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-33"},{"url":"https://github.com/advisories/GHSA-4jh7-c2vv-7qf2"}],"sources":{"cve":[{"id":"CVE-2025-3859","title":"Firefox Focus elide URL allows address bar spoofing","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.","status":"published","published":"2025-04-30T16:30:18.67Z","modified":"2026-04-13T14:28:36.1Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-451"],"updated_at":"2026-11-02T14:32:39.039362Z"}],"euvd":[{"id":"EUVD-2025-12733","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.","status":"published","published":"2025-04-30T16:30:18Z","modified":"2026-04-13T14:28:36Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:28.399811Z"}],"ghsa":[{"id":"GHSA-4jh7-c2vv-7qf2","title":"Websites directing users to long URLs that caused eliding to occur in the location view could...","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 affects Focus \u003c 138.","status":"published","published":"2025-04-30T18:31:55Z","modified":"2025-05-12T21:31:04Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-451","CWE-601"],"updated_at":"2026-11-02T15:02:14.203214Z"}],"nvd":[{"id":"CVE-2025-3859","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.","status":"published","published":"2025-04-30T17:15:50.903Z","modified":"2026-06-17T09:20:49.143Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-601","CWE-451"],"updated_at":"2026-11-02T14:11:02.570368Z"}]}}