CVE-2026-49740: TYPO3 CMS

Medium severity, CVSS 6.3. EPSS: 0.6% chance of exploitation in the next 30 days.

TYPO3's cache frontend (VariableFrontend) and persistent key-value store (Registry) deserialized PHP payloads without integrity validation or class restrictions. An attacker with write access to the underlying storage backend (cache store or sys_registry database table) could inject a crafted serialized payload to trigger PHP Object Injection, potentially exploiting a gadget chain to achieve Remote Code Execution or other high-impact effects. Exploiting this vulnerability requires direct local write access to the storage, such as the SQL database or file system. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30 and 14.0.0-14.3.2.

Affected products

• TYPO3 TYPO3 CMS: before 10.4.57 (fixed in 10.4.57); from 11.0.0, before 11.5.51 (fixed in 11.5.51); from 12.0.0, before 12.4.46 (fixed in 12.4.46); from 13.0.0, before 13.4.31 (fixed in 13.4.31); from 14.0.0, before 14.3.3 (fixed in 14.3.3)

Published 2026-06-09. Last modified 2026-07-23.