GHSA-c78m-c52x-jgwp
TYPO3 CMS has Insecure Deserialization via Core API
Quick fix
GHSA-c78m-c52x-jgwp — typo3/cms-core: upgrade to the fixed version with the command below.
composer require typo3/cms-core:^10.4.57Details
### Problem 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.
### Solution Update to TYPO3 versions 10.4.57 ELTS, 11.5.51 ELTS, 12.4.46 ELTS, 13.4.31 LTS, 14.3.3 LTS that fix the problem described.
### Credits TYPO3 CMS thanks “z3rco”, Chowdhury Faizal Ahammed, Rick Larabee, Vitaly Simonovich, Nozomu Sasaki, Mert Akdag, “tikket”, Shafi Almutairi for reporting this issue, and to TYPO3 core & security team member Oliver Hader for fixing it.
### Resources * [TYPO3-CORE-SA-2026-018](https://typo3.org/security/advisory/typo3-core-sa-2026-018)
Are you affected?
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Affected packages
0Fixed in: 10.4.57composer require typo3/cms-core:^10.4.5711.0.0Fixed in: 11.5.51composer require typo3/cms-core:^11.5.5112.0.0Fixed in: 12.4.46composer require typo3/cms-core:^12.4.4613.0.0Fixed in: 13.4.31composer require typo3/cms-core:^13.4.3114.0.0Fixed in: 14.3.3composer require typo3/cms-core:^14.3.3References
- https://github.com/TYPO3/typo3/security/advisories/GHSA-c78m-c52x-jgwp[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-49740[ADVISORY]
- https://github.com/TYPO3/typo3/commit/48bcf24f31f52cc0b43d3bea4984634bd2cf85c7[WEB]
- https://github.com/TYPO3/typo3/commit/87cd7c5b710c44d3606fed277b040a75dc6a9c02[WEB]
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2026-49740.yaml[WEB]
- https://github.com/TYPO3/typo3[PACKAGE]
- https://typo3.org/security/advisory/typo3-core-sa-2026-018[WEB]