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CVE-2026-113867

Stanza injection in XMPP chat

No known exploitation. EPSS puts it in the 7th percentile. Fixed versions are out.

CVSS —Not scoredEPSS percentile7th0.2% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix1 product2 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Mozilla ThunderbirdFixed builds153.5.1, 158.0.1Stated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS7th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.2% chance of exploitation activity in the next 30 days, which ranks it in the 7th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

4 events over 2 days, from the signal feeds we watch.

  1. Record updated
  2. Publishedrecord updated, record updated

Affected products

Sources

References in the record

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