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CVE-2026-102489

9.8, critical Known exploited

Zammad GmbH Zammad Session Fixation Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
1% higher than 69% of scored CVEs
Exploitation
Confirmed in the wild
Published
30 Sept 202617 days ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 2 Oct 2026. US federal agencies had to remediate by 5 Oct 2026, a deadline that has passed.

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.

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.

Details

Vendor
Zammad GmbH
Product
Zammad
Weakness
CWE-384 (opens in a new tab)
Status
Analyzed
Updated
10 Oct 2026
Assigner
csirt@divd.nl

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 5

Advisories 4

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Zammad GmbH CVEs

Every Zammad GmbH CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-102490 Zammad GmbH Zammad Improper Privilege Management Vulnerability KEV EPSS 0.5% 7.8, high

Beyond this page

Is CVE-2026-102489 in your network?

This page tells you how dangerous CVE-2026-102489 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2026-102489 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.