Release Notes

Security Advisory 2017-10: Security Update for OTRS Framework

OTRS Group, the world’s leading provider of the OTRS service management suite, including the fully managed OTRS solution and the ITIL® V3-compliant IT service management software OTRS::ITSM.


December 19, 2017 — Please read carefully and check if the version of your OTRS system is affected by this vulnerability.

Please send information regarding vulnerabilities in OTRS to:


Security Advisory Details


  • ID: OSA-2017-10
  • Date: 2017-12-19
  • Title: Session hijacking
  • Severity: 7.3. High
  • Product: OTRS 6.0.x, OTRS 5.0.x, OTRS 4.0.x
  • Fixed in: OTRS 6.0.3, OTRS 5.0.26, OTRS 4.0.28
  • URL:
  • References:


Vulnerability Description


This advisory covers vulnerabilities discovered in the OTRS framework.


Privilege Escalation


An attacker can send a specially prepared email to an OTRS system. If this system has cookie support disabled, and a logged in agent clicks a link in this email, the session information could be leaked to external systems, allowing the attacker to take over the agent’s session.


Affected by this vulnerability are all releases of OTRS 6.0.x up to and including 6.0.2, OTRS 5.0.x up to and including 5.0.25 and OTRS 4.0.x up to and including 4.0.27.

This vulnerability is fixed in the latest versions of OTRS, and it is recommended to upgrade to the latest patch level.

Fixed releases can be found at:

Detailed information about the changes:




However, to avoid unwanted side effects, we recommend a complete update.

Thanks to Francesco Sirocco for discovering and reporting this issue.

Release Name:

Security Advisory 2017-10: Security Update for OTRS Framework


  • pub 2048R/9C227C6B 2011-03-21 [expires at: 2020-11-16]
  • uid OTRS Security Team <>
  • GPG Fingerprint E330 4608 DA6E 34B7 1551 C244 7F9E 44E9 9C22 7C6B