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PHP CVE-2026-66398

| EUVDEUVD-2026-49331 CRITICAL
Download of Code Without Integrity Check (CWE-494)
2026-07-27 disclosure@vulncheck.com GHSA-c4f8-v76x-mwx3
9.4
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
9.4 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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 (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jul 27, 2026 - 17:02 EUVD
Analysis Generated
Jul 27, 2026 - 16:33 vuln.today
CVE Published
Jul 27, 2026 - 16:18 cve.org
CRITICAL 9.4

DescriptionCVE.org

phpMyFAQ before v4.1.6 contains a remote code execution vulnerability in the configuration API that allows authenticated administrators with CONFIGURATION_EDIT and ATTACHMENT_ADD privileges to write arbitrary PHP files by manipulating the upgrade.lastDownloadedPackage setting. Attackers can upload a malicious ZIP file as an attachment, point the updater configuration to its stored path, and extract it into the application root to achieve code execution as the web server user.

AnalysisAI

Remote code execution in phpMyFAQ before version 4.1.6 allows authenticated administrators with CONFIGURATION_EDIT and ATTACHMENT_ADD privileges to write arbitrary PHP files to the server. By uploading a malicious ZIP file as an attachment and then manipulating the upgrade.lastDownloadedPackage configuration setting to point to that file, an attacker can extract attacker-controlled PHP code into the web root, leading to code execution as the web server user. No known public exploit code or active exploitation has been reported at the time of this analysis.

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CVE-2026-66398 vulnerability details – vuln.today

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