CVE-2026-8727

Remote Code Execution in extension "Site Crawler" (crawler)

Published May 19, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

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

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
TYPO3
Published
Updated
May 19, 2026, 1:25 PM
Reserved
May 16, 2026, 9:55 AM
Status
Deferred
Published
May 19, 2026, 10:16 AM
Modified
Oct 26, 2026, 1:10 PM