ADVANCE-GUEST-POST · CVE-2026-118063 · Package
NO FIX YET · SEE WHAT TO DO
The Advance Guest Post WordPress plugin through version 1.9 checks uploaded file extensions with a case-sensitive, incomplete rule that is easy to bypass. An unauthenticated visitor can upload executable PHP variants into a web-reachable directory, which can lead to remote code execution depending on server configuration.
first public Nov 13, 2026 · 2 sources
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Sites running the Advance Guest Post plugin version 1.9 or earlier, where the guest post upload feature accepts files from anonymous visitors. Impact depends on server configuration: PHP execution in the upload directory is what turns an upload into code execution. Sites that do not run this plugin can skip it.
Not affected if plugin-not-installed, uploads-not-executable
Who cares php, self-hosted, wordpress
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The Advance Guest Post WordPress plugin through 1.9 does not properly validate uploaded files, relying on a case-sensitive and incomplete extension check that unauthenticated users can trivially bypass, allowing them to upload arbitrary files, including executable PHP variants, into a web-reachable directory, which can lead to remote code execution depending on the server configuration.
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