CVE-2026-0859

TYPO3 CMS Allows Insecure Deserialization via Mailer File Spool

State: Published
Severity: 5.2 Medium
Published: Jan 13, 2026
Updated: Jan 13, 2026
Reserved: Jan 12, 2026

Description

TYPO3's mail‑file spool deserialization flaw lets local users with write access to the spool directory craft a malicious file that is deserialized during the mailer:spool:send command, enabling arbitrary PHP code execution on the web server. This issue affects TYPO3 CMS versions 10.0.0-10.4.54, 11.0.0-11.5.48, 12.0.0-12.4.40, 13.0.0-13.4.22 and 14.0.0-14.0.1.

Scores

CVSS	Score	Vector	Source
4.0	5.2 Medium	CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H	TYPO3

Weaknesses

CWE-502 Deserialization of Untrusted Data

Affected Products

Product	Versions
TYPO3 CMSTYPO3	10.0.0 to before 10.4.55Affected 11.0.0 to before 11.5.49Affected 12.0.0 to before 12.4.41Affected 13.0.0 to before 13.4.23Affected 14.0.0 to before 14.0.2Affected

References

https://typo3.org/security/advisory/typo3-core-sa-2026-004vendor-advisory
Git commit of main branchpatch
Git commit of 13.4 branchpatch
Git commit of 12.4 branchpatch

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