CVE-2026-8727
HIGHRemote Code Execution in extension "Site Crawler" (crawler)
Title source: cnaDescription
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.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://typo3.org/security/advisory/typo3-ext-sa-2026-008
Scores
CVSS v4
7.1
EPSS
0.0040
EPSS Percentile
60.9%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-502
Status
published
Products (2)
TYPO3/Extension "Site Crawler"
< 11.0.13
TYPO3/Extension "Site Crawler"
12.0.0 - 12.0.11
Published
May 19, 2026
Tracked Since
May 19, 2026