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.
CISA due Oct 5, 2026
- Zammad GmbH Zammad
- High
- CVSS 8.7
- EPSS 1.26%
- Fixed version listed
What to do
Fixed version listed
- Required action
- Apply 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.
- CISA deadline for US federal agencies
- Oct 5, 2026
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| Zammad GmbH Zammad (Linux, Docker) | from 6.3.0, before 6.5.4 | 6.5.4 |
Advisories and fixes
- Vendor advisory zammad.com
Scores and signals
- Exploitation
- Exploited in the wild
- Severity
- High, CVSS 8.7 (v4.0, scored by DIVD)
- EPSS
- 1.26% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 23, 2026)
- CISA's SSVC decision points
- Exploitation: active. Automatable: no. Technical impact: total. As of Oct 2, 2026.
- Weakness
- CWE-384: Session Fixation
- Vendor
- Zammad GmbH, Zammad
Timeline
- Added to CISA's Known Exploited Vulnerabilities catalog: exploited in the wild. US federal agencies must remediate by 2026-10-05.