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Vulnerability · Published Jun 9, 2026 · Assigned by TYPO3

CVE-2026-49740TYPO3 CMS - Insecure Deserialization in Core API

Medium 6.3

In plain English

A medium-severity unsafe deserialization in TYPO3 CMS from TYPO3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium
Exploit odds (30 days)0.2%top 88.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagisttypo3/cms-core10.4.57GHSA-c78m-c52x-jgwp
Packagisttypo3/cms-core11.5.51GHSA-c78m-c52x-jgwp
Packagisttypo3/cms-core12.4.46GHSA-c78m-c52x-jgwp
Packagisttypo3/cms-core13.4.31GHSA-c78m-c52x-jgwp
Packagisttypo3/cms-core14.3.3GHSA-c78m-c52x-jgwp

Affected products (as reported)

VendorProductVersions
TYPO3 TYPO3 CMS 0 – before 10.4.5711.0.0 – before 11.5.5112.0.0 – before 12.4.4613.0.0 – before 13.4.3114.0.0 – before 14.3.3

Weakness: CWE-502 · Vector: 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

References