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CVE-2026-113867

unscored Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-29 18:28
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 17:36
  3. StatusReceived → PublishedNVD modified 2026-10-20 19:46
  4. First seenunscoredNVD modified 2026-10-20 20:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3