TYPO3 Remote Code Execution in extension "Site Crawler" (crawler)
The TYPO3 Crawler extension passes the X-T3Crawler-Meta response header from crawled URLs directly to PHP's unserialize(). An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server. Exploitation requires administrative privileges to configure a crawler-enabled page and trigger the crawl via a Scheduler task. This has been patched in versions 12.0.11 and 11.0.13.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | tomasnorre/crawler | >= 12.0.0, < 12.0.11, < 11.0.13 | 12.0.11, 11.0.13 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L- Weakness (CWE)
CWE-502- Platform
- Composer
- Package
tomasnorre/crawler- Disclosed
- 19.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-jr8m-x4p7-p3v5 - CC BY 4.0
Vulnerability history: tomasnorre/crawler
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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