CVE-2026-9507 – Session fixation vulnerability in Enhancesoft’s osTicket

CVE ID :CVE-2026-9507

Published : June 16, 2026, 1:16 p.m. | 25 minutes ago

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.

Severity: 5.1 | MEDIUM

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