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Exploited vulnerability · CISA KEV

Is CVE-2026-102489 exploited? Yes: in CISA KEV since 2 Oct 2026

Gociux · Zammad GmbH Zammad · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-102489, Zammad GmbH Zammad Session Fixation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 2 Oct 2026, 2 days after it was published. It affects Zammad GmbH Zammad. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 2 Oct 2026
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.7CVSS 4.0 · high
US federal due5 Oct 2026BOD 22-01 deadline

What it is

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.

VendorZammad GmbH (2 exploited CVEs in KEV)
ProductZammad
VulnerabilityZammad GmbH Zammad Session Fixation Vulnerability
WeaknessCWE-384
Published30 Sep 2026
Added to KEV2 Oct 2026
Reported by (CNA)DIVD

What to do

  1. Check whether you run it. Look for Zammad in your asset inventory, including appliances and cloud images. Stack check lists every exploited Zammad GmbH CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 30 Sep 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Zammad GmbH.

Other exploited CVEs in Zammad

References

Questions

Is CVE-2026-102489 being exploited?

Yes. CISA added CVE-2026-102489 to the Known Exploited Vulnerabilities catalog on 2 Oct 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-102489 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-102489?

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. Check Zammad GmbH's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Zammad and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in October 2026 · Zammad GmbH scorecard · act-now radar.

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