WordPress Custom Field Template <=2.7.8: Authenticated SQLi via post_ID
CVE-2026-9855 Published on September 19, 2026
Custom Field Template <= 2.7.8 - Authenticated (Contributor+) SQL Injection via 'post_ID' Parameter
The Custom Field Template plugin for WordPress is vulnerable to generic SQL Injection via the 'post_ID' parameter in all versions up to, and including, 2.7.8 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with contributor-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. The capability check via current_user_can('edit_post', $id) is bypassable because WordPress internally casts $id to an integer for the permission evaluation while the full unsanitized string is preserved and passed to the SQL sink, and a valid nonce which is also required can be legitimately obtained by any Contributor-level user from the post edit screen.
Timeline
Disclosed
Weakness Type
What is a SQL Injection Vulnerability?
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.
CVE-2026-9855 has been classified to as a SQL Injection vulnerability or weakness.
Affected Versions
hiroaki-miyashita Custom Field Template:- Before and including 2.7.8 is affected.