EUVD-2026-30865
GHSA-8x3j-439w-537c
CVSS VectorNVD
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
Lifecycle Timeline
3DescriptionNVD
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.
AnalysisAI
Remote code execution in the TYPO3 'Content Element Selector' extension allows unauthenticated attackers to execute arbitrary PHP code by sending a crafted cookie that the extension feeds directly into PHP's unserialize(). The flaw (CWE-502, CVSS 4.0 score 9.2) is exploitable only on installations where a content element is configured with 'Persistent Mode: Static'. …
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RemediationAI
Within 24 hours: Enumerate all TYPO3 instances with 'Content Element Selector' extension active, identify those configured with 'Persistent Mode: Static', and disable the extension if business impact permits; engage WAF team to begin rule development. Within 7 days: Deploy WAF rules blocking HTTP cookies containing PHP serialization signatures; parse web logs for exploitation attempts (look for suspicious cookie patterns); implement intrusion detection signatures for unserialize() attacks. …
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External POC / Exploit Code
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