CVE entry · CVE-2026-102489
CVE-2026-102489: Zammad GmbH Zammad Session Fixation Vulnerability
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.
- Actively exploited: added to CISA’s KEV catalog on October 2, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: October 5, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Zammad GmbH Zammad, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (zammad.com)
- Vendor advisory or reference cited by CISA (community.zammad.org)
- NVD entry (NIST)
- CISA KEV catalog