{"id":"CVE-2025-6429","state":"PUBLISHED","title":"Incorrect parsing of URLs could have allowed embedding of youtube.com","description":"Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag.  This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.","publishedAt":"2025-06-24T12:28:00.819Z","updatedAt":"2026-04-13T14:30:42.931Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","source":"CISA-ADP"},"assigner":"mozilla","products":["Mozilla Firefox","Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"128.12","status":"unaffected","lessThanOrEqual":"128.*","versionType":"rpm"},{"version":"140","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"128.12","status":"unaffected","lessThanOrEqual":"128.*","versionType":"rpm"},{"version":"140","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=1970658","https://www.mozilla.org/security/advisories/mfsa2025-51/","https://www.mozilla.org/security/advisories/mfsa2025-53/","https://www.mozilla.org/security/advisories/mfsa2025-54/","https://www.mozilla.org/security/advisories/mfsa2025-55/","https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html","https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html"],"weaknesses":["CWE-116"],"ingestedAt":"2026-10-29T20:10:04.440Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/6xxx/CVE-2025-6429.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-6429","state":"PUBLISHED","datePublished":"2025-06-24T12:28:00.819Z","dateUpdated":"2026-04-13T14:30:42.931Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2025-06-20T14:51:34.184Z"},"containers":{"cna":{"title":"Incorrect parsing of URLs could have allowed embedding of youtube.com","descriptions":[{"lang":"en","value":"Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag.  This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12."}],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"128.12","status":"unaffected","lessThanOrEqual":"128.*","versionType":"rpm"},{"version":"140","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"128.12","status":"unaffected","lessThanOrEqual":"128.*","versionType":"rpm"},{"version":"140","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1970658"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-51/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-53/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-54/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-55/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-04-13T14:30:42.931Z"},"credits":[{"lang":"en","value":"Masato Kinugawa"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.5,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","integrityImpact":"HIGH","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-06-25T14:21:21.354270Z","id":"CVE-2025-6429","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-116","type":"CWE","lang":"en","description":"CWE-116 Improper Encoding or Escaping of Output"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-06-25T14:28:51.535Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T20:07:03.248Z"}}]}}}