{"id":"CVE-2021-23986","state":"PUBLISHED","title":"A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request c","description":"A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87.","publishedAt":"2021-03-31T13:41:04.000Z","updatedAt":"2024-08-03T19:14:09.955Z","severity":null,"assigner":"mozilla","products":["Mozilla Firefox"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"unspecified","status":"affected","lessThan":"87","versionType":"custom"}]}],"references":["https://www.mozilla.org/security/advisories/mfsa2021-10/","https://bugzilla.mozilla.org/show_bug.cgi?id=1692623"],"weaknesses":[],"ingestedAt":"2026-10-29T19:48:04.982Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/23xxx/CVE-2021-23986.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-23986","state":"PUBLISHED","datePublished":"2021-03-31T13:41:04.000Z","dateUpdated":"2024-08-03T19:14:09.955Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2021-01-13T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87."}],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"unspecified","status":"affected","lessThan":"87","versionType":"custom"}]}],"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-10/","tags":["x_refsource_MISC"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1692623","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"description":"A malicious extension could have performed credential-less same origin policy violations","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"mozilla","dateUpdated":"2021-06-24T13:27:30.000Z","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security@mozilla.org","ID":"CVE-2021-23986","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Firefox","version":{"version_data":[{"version_affected":"<","version_value":"87"}]}}]},"vendor_name":"Mozilla"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"A malicious extension could have performed credential-less same origin policy violations"}]}]},"references":{"reference_data":[{"name":"https://www.mozilla.org/security/advisories/mfsa2021-10/","refsource":"MISC","url":"https://www.mozilla.org/security/advisories/mfsa2021-10/"},{"name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1692623","refsource":"MISC","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1692623"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-10/","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1692623","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T19:14:09.955Z"}}]}}}