CVE-2026-0859: TYPO3

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• TYPO3 TYPO3: from 10.0.0, before 10.4.55 (fixed in 10.4.55); from 11.0.0, before 11.5.49 (fixed in 11.5.49); from 12.0.0, before 12.4.41 (fixed in 12.4.41); from 13.0.0, before 13.4.23 (fixed in 13.4.23); from 14.0.0, before 14.0.2 (fixed in 14.0.2)

Published 2026-01-13. Last modified 2026-06-17.