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PHP EUVDEUVD-2026-65338

| CVE-2026-77138 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-08-25 TYPO3 GHSA-mj2c-4qfw-rhhc
Deserialization PHP RCE Extension Html5 Video Player Vs Powermail
9.3
CVSS 4.0 · Vendor: TYPO3
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Severity by source

Vendor (TYPO3) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/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

Primary rating from Vendor (TYPO3) · only source for this CVE.

CVSS VectorVendor: TYPO3

CVSS:4.0/AV:N/AC:L/AT:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 25, 2026 - 09:40 vuln.today
CVE Published
Aug 25, 2026 - 09:00 cve.org
CRITICAL 9.3

DescriptionCVE.org

The extension fails to safely process untrusted client input of an attacker-controlled cookie directly to PHP's unserialize(). A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server.

Articles & Coverage 1

News Critical RCE in PHP TYPO3 HTML5 Video Player Extension - CVE-2026-77138 Aug 26, 2026

AnalysisAI

Remote code execution in the TYPO3 'HTML5 Video Player vs. Powermail' extension allows a remote, unauthenticated attacker to achieve arbitrary code execution on the server by supplying a crafted serialized value in an attacker-controlled cookie that is passed to PHP's unserialize(). …

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EUVD-2026-65338 vulnerability details – vuln.today
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