{"id":"CVE-2026-100766","published":"2026-09-29T12:35:58Z","modified":"2026-09-30T17:20:03Z","title":"Information disclosure in the Networking: JAR component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.","provenance":"source","from":"CVE.org"},"cvss":{"score":4.3,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00251,"percentile":0.1651,"provenance":"source"},"cwes":[{"id":"CWE-200","name":"Exposure of Sensitive Information to an Unauthorized Actor"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2061526","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-100/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-102/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-103/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-98/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-99/","tags":[]}],"priority":{"score":6.3,"factors":[{"name":"EPSS percentile","points":3.3},{"name":"CVSS severity","points":3.01}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-88918","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-200"}}