CVE-2020-27662: 
GLPI vulnerability analysis and mitigation

In GLPI before version 9.5.3, ajax/comments.php contains an Insecure Direct Object Reference (IDOR) vulnerability that allows an attacker to read data from any database table (e.g., glpi_tickets, glpi_users, etc.) (NIST NVD, GitHub Advisory).

The vulnerability exists in the ajax/comments.php file and has been assigned a CVSS v3.1 Base Score of 4.3 MEDIUM (Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N). The issue is classified as CWE-639 (Authorization Bypass Through User-Controlled Key) (NIST NVD).

An attacker with a logged account (even with just self-service profile privileges) can read data from any database table in GLPI, including sensitive information from tables such as glpi_tickets and glpi_users (GitHub Advisory).

The vulnerability requires authentication but can be exploited by an account with minimal privileges such as a self-service profile. The attack complexity is low, requiring no user interaction to exploit (NIST NVD).

The vulnerability has been fixed in GLPI version 9.5.3. Users should upgrade to this version or later to address the security issue (GitHub Advisory).