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VULNERABILITIES

CVE-2026-113867 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2080073 [email protected]
https://www.mozilla.org/security/advisories/mfsa2026-114/ [email protected]
https://www.mozilla.org/security/advisories/mfsa2026-115/ [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-116Improper Encoding or Escaping of OutputCISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-113867
NVD Published Date:
Oct 20, 2026
NVD Last Modified:
Oct 29, 2026
Source:
[email protected]
CVE-2026-113867 Details - Not Deferred