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CVE-2026-102489

Zammad GmbH Zammad Session Fixation

9.8 CRITICALActively exploited (CISA KEV)EPSS 1.26%
  1. Published30 Sept 2026
  2. Added to CISA KEV2 Oct 2026
  3. Remediation due5 Oct 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 2 Oct 2026Federal remediation due: 5 Oct 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Zammad≥ 6.3.0 ≤ 6.5.4

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-102489 being actively exploited?

Yes. CVE-2026-102489 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2 Oct 2026.

How severe is CVE-2026-102489?

CVE-2026-102489 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.26% probability of exploitation.

Which products are affected by CVE-2026-102489?

Affected products include Zammad.

How do I fix CVE-2026-102489?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-102489 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.