CVE-2026-102489
critical CISA KEVZammad GmbH Zammad Session Fixation Vulnerability
Vendor / product: Zammad GmbH — Zammad
Zammad versions 6.3.0 to 6.5.4 are vulnerable a session hijack vulnerability that leads to remote code execution as the zammad user. The bug is also present in version 7.0.0 to version 7.1.2, but not exploitable due to changes in the underlying framework.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Required action (CISA)
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. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://community.zammad.org/t/take-care-local-privilege-escalation-cve-2026-102490-is-rep... csirt@divd.nl
- https://csirt.divd.nl/CVE-2026-102489 csirt@divd.nl
- https://csirt.divd.nl/DIVD-2026-00015 csirt@divd.nl
- https://zammad.com/en/advisories/cve-2026-102489-cve-2026-102490 csirt@divd.nl
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-102489 134c704f-9b21-4f2e-91b3-4a467353bcc0