CVE-2026-0859 MEDIUM

CVE-2026-0859: TYPO3 CMS Allows Insecure Deserialization via Mailer File Spool

Vendor Typo3
Product TYPO3 CMS
Weakness CWE-502 · Unsafe deserialization
Published January 13, 2026
Last update January 13, 2026
View on NVD All CVEs

CVSS base score

5.2/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

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.

Key dates

Disclosure timeline

January 13, 2026 CVE published
January 13, 2026 Record updated