Remote Code Execution in extension “Site Crawler” (crawler)_CVE-2026-8727

7.1 / 10

HIGH

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

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.

Basic Information

ID CVE-2026-8727

Source TYPO3

Published May 19, 2026 at 09:16

Affected Product

Vendor TYPO3

Product Extension "Site Crawler"

Version 12.0.0

Affected Versions TYPO3 Extension "Site Crawler" 12.0.0
TYPO3 Extension "Site Crawler" 0

CWE Classification

CWE-502

References

typo3.org /security/advisory/typo3-ext-sa-2026-008

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