The US Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-102489, a Zammad GmbH Zammad Session Fixation Vulnerability, to its Known Exploited Vulnerabilities (KEV) catalog on October 2, 2026. CISA adds a flaw to the catalog when it has reliable evidence that attackers are exploiting it in the wild.
What CISA says
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 KEV catalog entry for CVE-2026-102489
Key facts
| CVE | CVE-2026-102489 |
|---|---|
| Vendor / product | Zammad GmbH Zammad |
| Added to KEV | October 2, 2026 |
| Federal deadline | October 5, 2026 |
| Known ransomware use | Unknown |
| Weakness (CWE) | CWE-384 |
| CISA forensic triage | Yes |
| CVSS base score (NVD) | 9.4 Critical |
| CVSS vector | 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:C/RE:X/U:X |
Who has to act, and by when
US federal civilian executive branch agencies are required to remediate the vulnerability by October 5, 2026. CISA urges all organizations to prioritize KEV-listed flaws as part of their vulnerability management.
CISA’s required action for this entry:
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.
References
- CISA Known Exploited Vulnerabilities Catalog https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- NIST NVD — CVE-2026-102489 https://nvd.nist.gov/vuln/detail/CVE-2026-102489
- zammad.com https://zammad.com/en/product/releases/
- community.zammad.org https://community.zammad.org/t/take-care-local-privilege-escalation-cve-2026-102490-is-reported-as-being-actively-exploited/21297/2
- www.cisa.gov https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- www.cisa.gov https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk