{"id":"CVE-2025-5266","state":"PUBLISHED","title":"Script element events leaked cross-origin resource status","description":"Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.","publishedAt":"2025-05-27T12:29:25.084Z","updatedAt":"2026-04-13T14:29:08.538Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","source":"CISA-ADP"},"assigner":"mozilla","products":["Mozilla Firefox","Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"128.11","status":"unaffected","lessThanOrEqual":"128.*","versionType":"rpm"},{"version":"139","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"128.11","status":"unaffected","lessThanOrEqual":"128.*","versionType":"rpm"},{"version":"139","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=1965628","https://www.mozilla.org/security/advisories/mfsa2025-42/","https://www.mozilla.org/security/advisories/mfsa2025-44/","https://www.mozilla.org/security/advisories/mfsa2025-45/","https://www.mozilla.org/security/advisories/mfsa2025-46/","https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html","https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html"],"weaknesses":["CWE-200"],"ingestedAt":"2026-10-29T20:09:39.787Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/5xxx/CVE-2025-5266.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-5266","state":"PUBLISHED","datePublished":"2025-05-27T12:29:25.084Z","dateUpdated":"2026-04-13T14:29:08.538Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2025-05-27T12:29:24.726Z"},"containers":{"cna":{"title":"Script element events leaked cross-origin resource status","descriptions":[{"lang":"en","value":"Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11."}],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"128.11","status":"unaffected","lessThanOrEqual":"128.*","versionType":"rpm"},{"version":"139","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"128.11","status":"unaffected","lessThanOrEqual":"128.*","versionType":"rpm"},{"version":"139","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1965628"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-42/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-44/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-45/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-46/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-04-13T14:29:08.538Z"},"credits":[{"lang":"en","value":"Jakub Szymsza"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":4.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","integrityImpact":"NONE","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-09-23T14:44:04.447377Z","id":"CVE-2025-5266","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-200","type":"CWE","lang":"en","description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-09-23T14:44:14.612Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T20:06:04.324Z"}}]}}}