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CVE-2026-46725

CriticalPublished

Remote Code Execution in extension "Content Element Selector" (ceselector)

Published: May 19, 2026
Updated: May 19, 2026
Assigning CNA: TYPO3
Evidence observed: Aug 29, 2026

Primary CVSS

9.2/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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

EPSS probability estimate

2.6%

Low · next 30 days

Percentile: 84.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The extension passes an attacker-controlled cookie directly to PHP's unserialize() without safely processing the input. A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server. Exploitation requires the content element to be configured with "Persistent Mode: Static" in the plugin settings.

Sources

CVE-2026-46275Exploit
Python exploit for CVE-2026-46725, achieving unauthenticated remote code execution in TYPO3 ceselector extension via PHP object injection and Monolog gadget chain.

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