All vulnerabilities
CVE-2026-102489

Zammad GmbH Zammad Session Fixation Vulnerability

Zammad GmbH ZammadApplications & CMS
Open in ThreatlineRecord JSON
CVSS
8.7High
ExploitationExploited in the wildAdded to KEV 2 Oct 2026CISA KEV
Exploit odds (EPSS)1.26%Chance of exploitation activity in the next 30 days, higher than 69% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.5.4Fixed versionCVE List
Federal deadline5 Oct 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. CISA KEV
Patching is not enoughCISA requires federal agencies to look for signs of compromise on affected systems, not only patch (forensic triage under BOD 26-04). Treat exposed systems as possibly compromised. CISA guidance

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 30 Sep 2026, 16:21 UTCPublishedCVE List
  2. 2 Oct 2026Added to CISA KEVCISA KEV

Description

Zammad GmbH Zammad contains a session fixation vulnerability that can lead to remote code execution as the zammad user. This vulnerability can be chained with CVE-2026-102490.

Text from CVE List

Affected versions 3

  • Zammadunknown: * before 6.3.0CVE List
  • Zammadaffected: 6.3.0 before 6.5.4CVE List
  • Zammadunknown: 7.0.0 before 7.1.3CVE List

References 7