SOGo Authentication and XSS Vulnerabilities

SOGo before version 5.12.5 contains a cross-site scripting (XSS) vulnerability affecting the events, tasks, and contacts categories that allows authenticated attackers to inject malicious scripts. An attacker with valid SOGo credentials can craft malicious input in these modules that will execute in the context of other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions. No public exploit code or active exploitation has been documented in known exploit databases, but the vulnerability carries a moderate CVSS score of 6.4 reflecting its requirement for prior authentication combined with its ability to affect confidentiality and integrity across security domain boundaries.

SOGo versions prior to 5.12.5 contain two related one-time password (OTP) implementation weaknesses: the OTP is not regenerated when users disable and re-enable two-factor authentication, and the OTP length is only 12 digits instead of the cryptographically recommended 20 digits. While the CVSS score is low (2.0) due to high attack complexity and privileges required, this vulnerability could allow authenticated administrators or high-privilege users with social engineering capability to bypass or weaken OTP protections. No known active exploitation or public proof-of-concept exists, but the issue has been acknowledged and patched by the vendor.