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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.

PUBLISHED Reserved 2026-05-25 | Published 2026-06-16 | Updated 2026-06-16 | Assigner INCIBE




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-38 Path traversal: '\absolute\pathname\here'

Product status

Default status
unaffected

1.18.2
affected

Credits

Mario Valiente finder

References

www.incibe.es/...ixation-vulnerability-enhancesofts-osticket patch

cve.org (CVE-2026-9507)

nvd.nist.gov (CVE-2026-9507)

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