CVE-2026-9507
Description
A session fixation vulnerability has been identified in osTicket v1.18.2. This security flaw allows an attacker to hijack a victim’s account by keeping the initial session identifier (OSTSESSID) active after a successful login.
The issue lies in the fact that the application does not invalidate the pre-authentication cookie or generate a new identifier for the authenticated context. As a result, if an attacker manages to set a known session identifier in the victim’s browser, they will be able to maintain unauthorised access to the account once the victim has authenticated.
Summary dbcve.org
Session fixation vulnerability in osTicket v1.18.2 where the application fails to invalidate or regenerate the session identifier (OSTSESSID) after successful authentication, allowing an attacker who pre-sets a known session ID to maintain unauthorized access to the victim's account.
Mitigation
Implement session ID regeneration upon successful authentication and invalidate pre-authentication session cookies to prevent session fixation attacks.