{"id":"CVE-2026-53899","summary":"Cross-origin cookies could be leaked when opening a PDF link","details":"Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the target site. This vulnerability was fixed in Firefox for iOS 152.0.","modified":"2026-08-21T11:48:47.654301148Z","published":"2026-06-16T11:53:04.805Z","related":["CGA-4389-4mc9-3h2v"],"database_specific":{"cna_assigner":"mozilla","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53899.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53899.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53899"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2026-56/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2042909"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mozilla-mobile/firefox-ios","events":[{"introduced":"0"},{"fixed":"df0ceea8ef301835448e61fb2ed08a8bd30f8bbf"}],"database_specific":{"source":"CPE_RANGE","cpe":"cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:iphone_os:*:*","extracted_events":[{"introduced":"0"},{"fixed":"152.0"}]}}],"versions":["firefox-v151.1","firefox-v151.0","firefox-v150.1","firefox-v149.2","firefox-v149.0","focus/klar-v148.2","firefox-v148.1","firefox-v147.5","firefox-v147.4","firefox-v146.1","firefox-v145.2","firefox-v144.3","firefox-v144.2","firefox-v144.1","focus/klar-v143.0","firefox-v142.0","20.1","AuroraV15","AuroraV14","AuroraV13","AuroraV11","AuroraV10","AuroraV8","AuroraV7","AuroraV6","AuroraV2","AuroraV1","AuroraV3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53899.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}