Description
The 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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| TYPO3 | Extension "Site Crawler" | 12.0.0 – < 12.0.11, < 11.0.13 | 12.0.11 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | tomasnorre/crawler | >= 12.0.0, < 12.0.11 | 12.0.11 | GHSA-jr8m-x4p7-p3v5 |
| Packagist | tomasnorre/crawler | < 11.0.13 | 11.0.13 | GHSA-jr8m-x4p7-p3v5 |
Advisories 1
- WID-SEC-2026-1585 TYPO3 Extensions: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 19, 2026
References
- https://typo3.org/security/advisory/typo3-ext-sa-2026-008 vendor-advisory