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Known exploited vulnerability

CVE-2026-102489

criticalCVSS 4.0 9.4In CISA KEVEPSS 50%Published · Zammad GmbH

The short answer

CVE-2026-102489 affects Zammad GmbH Zammad and is rated critical (CVSS 9.4). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-10-02: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-384.

Severity

9.4 critical

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

Exploited (CISA KEV)

Yes, since Oct 2, 2026

Federal due date Oct 5, 2026

EPSS, next 30 days

50%

Higher than 99% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Attack requirements
None
Privileges required
None
User interaction
Passive
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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…

Affected products

Zammad. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-102489 being exploited?

Yes. CISA added CVE-2026-102489 to its Known Exploited Vulnerabilities catalog on 2026-10-02, with a federal remediation due date of 2026-10-05.

How do I fix CVE-2026-102489?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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