Live › vulnerability › CVE-2026-113867
Go to dashboardThunderbird did not escape attribute values when building outgoing XMPP stanzas, and it echoed incoming request values into automatic replies. A remote XMPP user can send a crafted request that makes Thunderbird inject arbitrary stanzas into the user's connection, which the server treats as sent by the user.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Only Thunderbird users who have an XMPP chat account configured are exposed, because the flaw is in the chat feature for XMPP accounts. Mail-only users and users of other chat protocols are not affected by this issue.
No product ranges from the sources yet.
thunderbird --version where available.158.0.1 or 153.5.1 (the fixed releases named in the source).Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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