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.
Published: 2026-05-19
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-jr8m-x4p7-p3v5 TYPO3 Remote Code Execution in extension "Site Crawler" (crawler)
History

Wed, 20 May 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Typo3
Typo3 extension "site Crawler"
Vendors & Products Typo3
Typo3 extension "site Crawler"

Tue, 19 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 19 May 2026 10:15:00 +0000

Type Values Removed Values Added
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.
Title Remote Code Execution in extension "Site Crawler" (crawler)
Weaknesses CWE-502
References
Metrics cvssV4_0

{'score': 7.1, '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'}


Subscriptions

Typo3 Extension "site Crawler"
cve-icon MITRE

Status: PUBLISHED

Assigner: TYPO3

Published:

Updated: 2026-05-19T13:25:34.994Z

Reserved: 2026-05-16T09:55:33.916Z

Link: CVE-2026-8727

cve-icon Vulnrichment

Updated: 2026-05-19T13:25:31.426Z

cve-icon NVD

Status : Deferred

Published: 2026-05-19T10:16:25.747

Modified: 2026-06-17T11:04:20.503

Link: CVE-2026-8727

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-20T10:39:40Z

Weaknesses