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.

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Advisories

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Fixes

Solution

The current (legacy) source code is in maintenance mode, whilst Enhancesoft is focusing on a complete rewrite of the code (v2.0). This means that release cycles and security updates for the legacy code have been significantly delayed.


Workaround

No workaround given by the vendor.

History

Tue, 16 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 16 Jun 2026 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Enhancesoft
Enhancesoft osticket
Vendors & Products Enhancesoft
Enhancesoft osticket

Tue, 16 Jun 2026 13:15:00 +0000

Type Values Removed Values Added
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.
Title Session fixation vulnerability in Enhancesoft's osTicket
Weaknesses CWE-38
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: INCIBE

Published:

Updated: 2026-06-16T16:18:10.713Z

Reserved: 2026-05-25T13:36:09.788Z

Link: CVE-2026-9507

cve-icon Vulnrichment

Updated: 2026-06-16T16:18:06.428Z

cve-icon NVD

Status : Deferred

Published: 2026-06-16T13:16:38.140

Modified: 2026-06-16T15:36:43.610

Link: CVE-2026-9507

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-16T15:00:06Z

Weaknesses