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CVE-2026-102489: Zammad GmbH Zammad Session Fixation Vulnerability

Zammad GmbH · Zammad

Listed by CISA as exploited in the wild since 2 Oct 2026. Below: exploitation status, EPSS and every published CVSS, each with its source, then affected versions and references.

Build snapshot collected · KEV catalog 2026.10.02 · EPSS of 2 Oct 2026 · not a live feed: collected once, at build time

Description

as written by CISA (KEV catalog)

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.

Required action

CISA KEV

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.

Affected products and versions

CVE record · DIVD

  • Zammad GmbH · Zammad

    • unknown: before 6.3.0
    • affected: from 6.3.0 before 6.5.4
    • unaffected: from 7.0.0 before *

Status words (affected, unaffected, unknown) and version bounds are copied from the record. An upper bound such as “before 7.1.0” usually marks the first fixed version; confirm in the vendor advisory before planning an upgrade.

References

CISA KEV notes and CVE record

EPSS over the last 30 days

See also: the full KEV catalog

Related entries

Other Zammad GmbH entries in KEV

Added in the same week (see the week)

Questions about CVE-2026-102489

Is CVE-2026-102489 being exploited?

Yes, according to CISA. CVE-2026-102489 was added to the Known Exploited Vulnerabilities catalog on 2 Oct 2026, which CISA does only with reliable evidence of exploitation in the wild. The catalog field for ransomware campaign use says "Unknown".

What is the deadline to remediate CVE-2026-102489?

CISA set 5 Oct 2026 as the due date for US Federal Civilian Executive Branch agencies. The date is binding only for those agencies; other organisations can read it as a measure of urgency.

What is the EPSS score of CVE-2026-102489?

0.58%, in the 46th percentile, in the FIRST EPSS model of 2 Oct 2026. It estimates the probability of exploitation activity in the following 30 days. For a CVE already in KEV the score is secondary: exploitation has been observed.

How severe is CVE-2026-102489?

NVD rates it 9.8 CRITICAL (CVSS 3.1); divd.nl rates it 9.4 CRITICAL (CVSS 4.0). These are the published assessments as of 3 Oct 2026; this site does not rescore.

Which product does CVE-2026-102489 affect?

Zammad GmbH Zammad, as named in the CISA catalog. The affected versions listed in the CVE record are on this page; the vendor advisory in the references is the authority on fixed versions.

Related sections