CVE-2026-49740

TYPO3 CMS - Insecure Deserialization in Core API

State: Published
Severity: 6.3 Medium
Published: Jun 9, 2026
Updated: Jul 15, 2026
Reserved: Jun 1, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	CVSS:4.0/AV:L/AC:L/AT:N/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	before 10.4.57Affected 11.0.0 to before 11.5.51Affected 12.0.0 to before 12.4.46Affected 13.0.0 to before 13.4.31Affected 14.0.0 to before 14.3.3Affected

References

https://typo3.org/security/advisory/typo3-core-sa-2026-018vendor-advisory
Git commit of main branchpatch
Git commit of 13.4 branchpatch

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