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CVE-2026-113867

N/A

Published 2026-10-20 · Last modified 2026-10-20

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.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 7th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

—CVSS · not scored

  • No impact metrics

Proof of concept

No public PoC is currently catalogued.

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Data snapshot:

Affected

Vendors Mozilla

Products Thunderbird

Weakness (CWE)

Not classified.

CVSS vector

Not yet scored.

References and research data (JSON)

Vendor product assessments

  • thunderbird as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird

    • none available: Fix deferred
    Red Hat · CVE-2026-113867 · Updated 2026-10-20T20:08:57+00:00
  • thunderbird.src as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-113867 · Updated 2026-10-20T20:08:57+00:00
  • thunderbird as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird

    • none available: Fix deferred
    Red Hat · CVE-2026-113867 · Updated 2026-10-20T20:08:57+00:00
  • thunderbird.src as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-113867 · Updated 2026-10-20T20:08:57+00:00
  • thunderbird as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird

    • none available: Fix deferred
    Red Hat · CVE-2026-113867 · Updated 2026-10-20T20:08:57+00:00
  • thunderbird.src as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-113867 · Updated 2026-10-20T20:08:57+00:00

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS