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CVE-2026-66398 is a remote code execution vulnerability affecting phpMyFAQ versions prior to 4.1.6. The flaw resides in the configuration API and stems from unsafe handling of the updater-related setting upgrade.lastDownloadedPackage. An authenticated administrator with both CONFIGURATION_EDIT and ATTACHMENT_ADD privileges can upload a malicious ZIP archive as an attachment, modify the updater configuration to reference the stored archive path, and cause its contents to be extracted into the application root. By placing attacker-controlled PHP content in a web-accessible location, the attacker can write arbitrary PHP files and execute code in the context of the web server user.
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Cross-references every affected SKU, including bundled OEM variants.
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