CVE-2026-102489Undisclosed RCE in Zammad v6.3 and higher
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.4 | CRITICAL | 4.0DIVD (CNA) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/AU:Y/V:C |
| 8.7 | HIGH | 4.0DIVD (CNA) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:A/AU:Y/V:C |
| 9.8 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CISA required action
⚡ Known exploited · remediation due Oct 5, 2026
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.
Details
- CVE ID
- CVE-2026-102489
- Status
- Analyzed
- Assigner (CNA)
- DIVD
- Published
- Sep 30, 2026
- Last modified
- 2026-10-19 09:10 UTC
- Weaknesses
Affected Products
As published by the CNA in the CVE record.
Zammad GmbHZammad1 version range
- 6.3.0 before 6.5.4
References
- community.zammad.org https://community.zammad.org/t/take-care-local-privilege-escalation-cve-2026-102490-is-reported-as-being-actively-exploited/21297/2
- csirt.divd.nl https://csirt.divd.nl/CVE-2026-102489
- csirt.divd.nl https://csirt.divd.nl/DIVD-2026-00015
- zammad.com https://zammad.com/en/advisories/cve-2026-102489-cve-2026-102490
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-102489