TYPO3 Remote Code Execution in extension "Content Element Selector" (ceselector)
The TYPO3 "Content Element Selector" (ceselector) extension passes an attacker-controlled cookie directly to PHP's unserialize() without safely processing the input. A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server. Exploitation requires the content element to be configured with Persistent Mode: Static in the plugin settings. This has been patched in version 3.0.3, 4.0.2, 5.0.1, and 6.0.1.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | mmc/ceselector | >= 6.0.0, < 6.0.1, >= 5.0.0, < 5.0.1, >= 4.0.0, < 4.0.2, < 3.0.3 | 6.0.1, 5.0.1, 4.0.2, 3.0.3 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-502- Platform
- Composer
- Package
mmc/ceselector- Disclosed
- 19.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8x3j-439w-537c - CC BY 4.0
Vulnerability history: mmc/ceselector
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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