# CVE-2026-9507

## Summary

- **CVE ID:** CVE-2026-9507
- **Severity:** MEDIUM
- **CVSS Score:** 5.1 (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)
- **CWE:** CWE-38
- **Published:** Jun 16, 2026
- **Last Modified:** Jun 16, 2026

## 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.

## Affected Products

- Enhancesoft — osTicket (1.18.2)

## References

- [CNA](https://www.incibe.es/en/incibe-cert/notices/aviso/session-fixation-vulnerability-enhancesofts-osticket)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.40%
- **EPSS Percentile:** 33.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._