CVE-2026-102489 Exploited in the wild

Zammad GmbH Zammad Session Fixation Vulnerability

Risk score: 100/100
CVSS: 9.8 v3.1
Exploit chance (30 days): 1.3%
Published: 30 Sep 2026
Added to CISA's exploited list: 2 Oct 2026

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What to know

What it is: Zammad versions 6.3.0 to 6.5.4 are vulnerable to a session hijack vulnerability that leads to remote code execution as the zammad user. An attacker could exploit this vulnerability to gain remote code execution.
Affected: {'products': ['Zammad'], 'packages': [], 'versions': ['6.3.0 to 6.5.4', '7.0.0 to 7.1.2']}
Fix: Apply mitigations in accordance with vendor instructions
Exploitation: Exploited in the wild

Why it is Red

CVSS 9.8 critical
Exploited in the wild (CISA KEV)
Remotely exploitable without logging in

CISA 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. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

Original description

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.

Last activity 2 Oct 2026. Patch Forecast updates every hour.