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.
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.
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.
| Score | Percentile |
|---|---|
| 0.25% | 48.13% |
| Base score | Version | Severity | Vector |
|---|---|---|---|
| 6.3 | 4.0 | — |
|
| Type | Value |
|---|---|
| GHSA | GHSA-c78m-c52x-jgwp ↗ |
| CVE | CVE-2026-49740 ↗ |
| CWE id | Name |
|---|---|
| CWE-502 | Deserialization of Untrusted Data |
Vulnerable version ranges and first patched releases as published by GitHub.
| Ecosystem | Package | Vulnerable range | First patched | Vulnerable functions |
|---|---|---|---|---|
| composer | typo3/cms-core | < 10.4.57 | 10.4.57 | — |
| composer | typo3/cms-core | >= 11.0.0, < 11.5.51 | 11.5.51 | — |
| composer | typo3/cms-core | >= 12.0.0, < 12.4.46 | 12.4.46 | — |
| composer | typo3/cms-core | >= 13.0.0, < 13.4.31 | 13.4.31 | — |
| composer | typo3/cms-core | >= 14.0.0, < 14.3.3 | 14.3.3 | — |