Executive brief
Admidio is an open-source platform used for managing memberships and user data for organizations. A security flaw in its inventory management module allows users with basic access to bypass standard security checks and save unauthorized or malicious data. This could lead to the corruption of inventory records or be used to launch further attacks against other administrators.
Technical details
A vulnerability exists in the 'item_save' endpoint of Admidio's inventory module due to improper handling of the 'imported' POST parameter. When this parameter is set to true, the application's ItemService::save() method skips both CSRF token verification and server-side form validation (FormPresenter). An authenticated attacker can exploit this by sending a direct POST request with raw, unsanitized data. This bypass allows for Cross-Site Request Forgery (CSRF) attacks and the injection of arbitrary data into the database, which may result in stored Cross-Site Scripting (XSS) if the data is later rendered without proper encoding. The issue is fixed in version 5.0.8 by ensuring validation occurs regardless of the import flag.
Affected products
- Admidio Admidio < 5.0.8
Timeline
- 2026-03-27: advisory: GitHub Security Advisory published
- 2026-03-31: disclosed: CVE-2026-34383 published
- 2026-03-31: patched: Fixed in version 5.0.8