CVE-2025-57759: 
PHP vulnerability analysis and mitigation

CVE-2025-57759 is a security vulnerability discovered in Contao, an Open Source CMS. The vulnerability was disclosed on August 28, 2025, affecting versions starting from 5.3.0 and prior to 5.3.38 and 5.6.1. Under certain conditions, back end users may be able to edit fields of pages and articles without having the necessary permissions (Contao Advisory, GitHub Advisory).

The vulnerability is classified as an Improper Privilege Management issue (CWE-269), where the system does not properly assign, modify, track, or check privileges for an actor. It has been assigned a CVSS v3.1 base score of 4.3 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N. This indicates that the vulnerability requires network access, low attack complexity, low privileges, and no user interaction to exploit (GitHub Advisory).

The vulnerability allows authenticated back end users to bypass permission restrictions and edit fields of pages and articles without having the necessary permissions. While the confidentiality impact is none and there is no impact on availability, there is a low impact on data integrity (GitHub Advisory).

The vulnerability has been patched in Contao versions 5.3.38 and 5.6.1. Users are advised to upgrade to these patched versions as there are no workarounds available (Contao Advisory).