{"id":"CVE-2025-10859","aliases":["EUVD-2025-31731","GHSA-q64v-9mh2-3xcq"],"status":"published","title":"Data stored in cookies for non-HTML content while browsing Incognito could be viewed after closing private tabs","description":"Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs. This vulnerability was fixed in Firefox for iOS 143.1.","severity":{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.0012,"percentile":0.01832,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-359"],"published":"2025-09-30T12:49:07Z","modified":"2026-10-05T15:10:00Z","products":[{"vendor":"mozilla","product":"firefox"},{"vendor":"mozilla","product":"firefox for ios"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1684624","tags":["Issue Tracking","Permissions Required"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-79/","tags":["Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-10859"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-79"},{"url":"https://github.com/advisories/GHSA-q64v-9mh2-3xcq"}],"sources":{"cve":[{"id":"CVE-2025-10859","title":"Data stored in cookies for non-HTML content while browsing Incognito could be viewed after closing private tabs","description":"Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs. This vulnerability was fixed in Firefox for iOS 143.1.","status":"published","published":"2025-09-30T12:49:07.059Z","modified":"2026-04-13T14:31:38.944Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-359"],"updated_at":"2026-11-02T14:32:30.643267Z"}],"euvd":[{"id":"EUVD-2025-31731","description":"Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs. This vulnerability was fixed in Firefox for iOS 143.1.","status":"published","published":"2025-09-30T12:49:07Z","modified":"2026-04-13T14:31:38Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:27.958964Z"}],"ghsa":[{"id":"GHSA-q64v-9mh2-3xcq","title":"Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing...","description":"Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs This vulnerability affects Firefox for iOS \u003c 143.1.","status":"published","published":"2025-09-30T15:30:29Z","modified":"2025-09-30T15:30:30Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-359"],"updated_at":"2026-11-02T15:03:49.069159Z"}],"nvd":[{"id":"CVE-2025-10859","description":"Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs. This vulnerability was fixed in Firefox for iOS 143.1.","status":"published","published":"2025-09-30T13:15:48.55Z","modified":"2026-10-05T15:10:00.59Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-359"],"updated_at":"2026-11-02T14:11:34.090044Z"}]}}