CVE-2026-0859

HIGH

Typo3 < 10.4.55 - Insecure Deserialization

Title source: rule

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.

References (4)

[Patch] https://github.com/TYPO3/typo3/commit/3225d705080a1bde57a66689621c947da5a4782f

View Patch ZIP pw:eip

[Patch] https://github.com/TYPO3/typo3/commit/722bf71c118b0a8e4f2c2494854437d846799a13

[Patch] https://github.com/TYPO3/typo3/commit/e0f0ceee480c203fbb60b87454f5f193e541d27f

[Vendor Advisory] https://typo3.org/security/advisory/typo3-core-sa-2026-004

Scores

CVSS v3 7.8

EPSS 0.0003

EPSS Percentile 7.8%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-502

Status published

Affected Products (2)

typo3/typo3 < 10.4.55

typo3/cms-core < 14.0.2Packagist

Timeline

Published Jan 13, 2026

Tracked Since Feb 18, 2026