PT-2026-49702 · Enhancesoft · Osticket

Mario Valiente · Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-9507

Mitre

CVSS v4.0

5.1

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

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.

Fix

Weakness Enumeration

CWE-38

Related Identifiers

CVE-2026-9507

Affected Products

Osticket

References · 2

• https://incibe.es/en/incibe-cert/notices/aviso/session-fixation-vulnerability-enhancesofts-osticket · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-9507 · Security Note