VulnerabilityDeferred

CVE-2026-8727

An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server.

HIGH 7.1EPSS 0.39%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.39%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 4.0: 7.1 HIGHCVSS: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/M
EPSS: 0.39% probability · 33th percentile
CISA KEV: Not listed
Weakness: CWE-502
Source: f4fb688c-4412-4426-b4b8-421ecf27b14a

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.