CVE-2026-9507: Enhancesoft Osticket

Medium severity, CVSS 5.1. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Enhancesoft Osticket: version 1.18.2 only

Published 2026-06-16. Last modified 2026-06-17.