How severe is CVE-2026-102489?

CVE-2026-102489 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-102489 being actively exploited?

Yes. CVE-2026-102489 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-10-02, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-102489?

CVE-2026-102489 affects Zammad. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-102489?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2026-102489 published?

CVE-2026-102489 was published on 2026-09-30 and last updated on 2026-10-03.

CVE-2026-102489

CVE-2026-102489 is a critical-severity vulnerability in Zammad with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-10-02). The underlying weakness is classified as CWE-384.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.4
EPSS exploit prediction: 1% (72nd percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-10-02)
Weakness: CWE-384
Affected product: Zammad
Published: 2026-09-30
Last modified: 2026-10-03

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 vulnerability is also present in version 7.0.0 to version 7.1.3, but not exploitable due to environment conditions.

Frequently asked questions

What is CVE-2026-102489?: 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 vulnerability is also present in version 7.0.0 to version 7.1.3, but not exploitable due to environment conditions.
How severe is CVE-2026-102489?: CVE-2026-102489 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-102489 being actively exploited?: Yes. CVE-2026-102489 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-10-02, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-102489?: CVE-2026-102489 affects Zammad. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-102489?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2026-102489 published?: CVE-2026-102489 was published on 2026-09-30 and last updated on 2026-10-03.

References

Affected products (1)

cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*

More vulnerabilities in Zammad

CVE-2026-102490 — Critical (CVSS 9.8): All versions of Zammad including the latest alpha enable the local zammad user to escalate privileges to root.
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