CVE-2026-118063: critical vulnerability in Advance Guest Post
Advance Guest Post <= 1.9 - Unauthenticated Arbitrary File Upload via gallery_action
Published
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25Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Unknown · Advance Guest PostRelated CVEs — Advance Guest Post
In the same product, most dangerous first.