PT-2026-47747 · Typo3 Association · Typo3/Cms

Mert Akdag + 7 · CVE-2026-49740 · Published 2026-06-09 · Updated 2026-06-12

Positive Technologies (AI Summary)

CVSS v4.0

6.3

Medium

Base vector

AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H

Name of the Vulnerable Software and Affected Versions TYPO3 CMS versions prior to 10.4.57 TYPO3 CMS versions 11.0.0 through 11.5.51 TYPO3 CMS versions 12.0.0 through 12.4.46 TYPO3 CMS versions 13.0.0 through 13.4.31 TYPO3 CMS versions 14.0.0 through 14.3.3

Description The cache frontend (VariableFrontend) and persistent key-value store (Registry) deserialize PHP payloads without integrity validation or class restrictions. An attacker with write access to the underlying storage backend, such as the file system or the sys registry database table, can inject a crafted serialized payload to trigger PHP Object Injection. This may allow the exploitation of a gadget chain to achieve Remote Code Execution.

Recommendations Update to version 10.4.57 or later. Update to version 11.5.52 or later. Update to version 12.4.47 or later. Update to version 13.4.32 or later. Update to version 14.3.4 or later.

Exploit

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-49740

GHSA-C78M-C52X-JGWP

Affected Products

Typo3/Cms

References · 12

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49740.json · Exploit
• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2026-49740.yaml · Exploit
• https://github.com/TYPO3/typo3/commit/48bcf24f31f52cc0b43d3bea4984634bd2cf85c7 · Patch
• https://github.com/TYPO3/typo3/commit/87cd7c5b710c44d3606fed277b040a75dc6a9c02 · Patch
• https://osv.dev/vulnerability/CVE-2026-49740 · Vendor Advisory
• https://typo3.org/security/advisory/typo3-core-sa-2026-018 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-49740 · Security Note
• https://osv.dev/vulnerability/GHSA-c78m-c52x-jgwp · Vendor Advisory
• https://github.com/TYPO3/typo3 · Note
• https://github.com/TYPO3/typo3/security/advisories/GHSA-c78m-c52x-jgwp · Note
• https://packagist.org · Note
• https://twitter.com/CVEnew/status/2064342499619934676 · Twitter Post