SecuriTricks - CVE-2026-8727

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.

Product(s) Impacted

Vendor	Product	Versions
Typo3	Typo3 Crawler Extension	* *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-502

Deserialization of Untrusted Data

The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	typo3	typo3	/	/	/	/	/	/	/	/
a	typo3	crawler_extension	/	/	/	/	/	/	/	/

References

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

CVSS Score

7.1 / 10

CVSS Data - 4.0

Attack Vector: NETWORK
Attack Complexity: HIGH
Attack Requirements: PRESENT
Privileges Required: HIGH
User Interaction: ACTIVE
Scope:
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: HIGH
Exploit Maturity: NOT_DEFINED

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

View Vector String

Timeline

Published: May 19, 2026, 10:16 a.m.
Last Modified: May 19, 2026, 2:47 p.m.

Status : Deferred

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

f4fb688c-4412-4426-b4b8-421ecf27b14a

CVE-2026-8727