{"id":"CVE-2026-113867","published":"2026-10-20T20:17:19Z","modified":"2026-10-29T19:17:16Z","title":"Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas","vendor":"Mozilla","product":"Thunderbird","tier":"core","eol":null,"description":{"text":"Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","provenance":"source","from":"NVD"},"summary":null,"cvss":{"score":9.1,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.00399,"percentile":0.34074,"date":"2026-10-30","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":6,"pulses":[{"name":"Known_Cve | Oct 29, 2026 | Part 1/3","url":"https://otx.alienvault.com/pulse/6ae20c23cd267c7cddd4e545","created":"2026-10-28"},{"name":"Known_Cve | Oct 28, 2026 | Part 1/3","url":"https://otx.alienvault.com/pulse/6ae0ba88997d8920e9952075","created":"2026-10-27"},{"name":"Known_Cve | Oct 27, 2026 | Part 1/3","url":"https://otx.alienvault.com/pulse/6adf68beabc3bad24a2b7cc6","created":"2026-10-26"},{"name":"Known_Cve | Oct 24, 2026 | Part 2/3","url":"https://otx.alienvault.com/pulse/6adb741adaae4be68dd04fea","created":"2026-10-23"},{"name":"Known_Cve | Oct 23, 2026 | Part 2/3","url":"https://otx.alienvault.com/pulse/6ada237de8198eb6a6cbfac4","created":"2026-10-22"},{"name":"Known_Cve | Oct 22, 2026 | Part 3/4","url":"https://otx.alienvault.com/pulse/6ad8d34cb141a6cceeba88be","created":"2026-10-21"}],"provenance":"machine"},"cwes":[{"id":"CWE-116","name":"Improper Encoding or Escaping of Output"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2080073","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-114/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-115/","tags":[]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-105294","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105294","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[],"timeline":[{"date":"2026-10-20","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113867","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":15.1,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":6.81,"detail":"percentile 0.3407"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":1.92,"detail":"6 pulses"},{"name":"CVSS severity","points":6.37,"detail":"base score 9.1"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}