What the vulnerability does
01Description
The Tainacan plugin for WordPress is vulnerable to unauthorized metadata section creation due to missing authorization checks in all versions up to, and including, 1.0.1. This is due to the `create_item_permissions_check()` function unconditionally returning true, which bypasses authentication and authorization validation. This makes it possible for unauthenticated attackers to create arbitrary metadata sections for any collection via the public REST API granted they can access the WordPress site.
Explanation of Vulnerability in Simple Terms
02Summary
Tainacan versions 1.0.1 and earlier lack proper authorization checks, allowing unauthenticated attackers to modify data through network requests. The vulnerability does not expose sensitive information or disrupt availability, but permits unauthorized changes to site content. Update to version 1.1.0 or later to remediate.
What an attacker can do
03Attacker Capabilities
Modify site data without authentication or user interaction.
Potential impact on your site
04Site Impact
Unauthorized users can alter content, potentially corrupting your digital collection or metadata.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user action required.
Key dates
06Disclosure timeline
December 21, 2025
CVE published
April 8, 2026
Record updated
