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PatchSiren cyber security CVE debrief

CVE-2026-102489 Zammad GmbH CVE debrief

A session fixation vulnerability exists in Zammad GmbH Zammad. This issue allows an attacker to fixate a user's session, potentially leading to unauthorized access. The vulnerability is considered high risk and has been added to the CISA Known Exploited Vulnerabilities catalog. Defenders and administrators of Zammad GmbH Zammad installations should assess exposure and prioritize remediation to prevent potential unauthorized access. The vulnerability allows an attacker to fixate a user's session. This issue is considered high risk and has been added to the CISA Known Exploited Vulnerabilities catalog. However, specific technical details about the vulnerability are limited. The CISA

Vendor
Zammad GmbH
Product
Zammad
CVSS
HIGH 8.7
CISA KEV
Listed
Original CVE published
2026-10-02
Original CVE updated
2026-10-02
Advisory published
2026-10-02
Advisory updated
2026-10-02

Who should care

Defenders and administrators of Zammad GmbH Zammad installations should assess exposure and prioritize remediation. This vulnerability is considered high risk and has been added to the CISA Known Exploited Vulnerabilities catalog.

Why it matters

The Zammad GmbH Zammad session fixation vulnerability is considered high risk and has been added to the CISA Known Exploited Vulnerabilities catalog. Defenders and administrators of Zammad GmbH Zammad installations should assess exposure and prioritize remediation to prevent potential unauthorized access.

  • Potential unauthorized access to user sessions
  • Possible exploitation by attackers to gain unauthorized access

Technical summary

The Zammad GmbH Zammad session fixation vulnerability allows an attacker to fixate a user's session. This issue is considered high risk and has been added to the CISA Known Exploited Vulnerabilities catalog. However, specific technical details about the vulnerability are limited.

Defensive priority

High

Recommended defensive actions

  • Apply mitigations in accordance with vendor instructions
  • Ensure compliance with CISA's BOD 26-04 guidance
  • Evaluate asset internet exposure and adhere to BOD 26-04 patching guidelines

Evidence notes

The vulnerability is described as a session fixation issue in Zammad GmbH Zammad. The CISA Known Exploited Vulnerabilities catalog lists this vulnerability as actively exploited. However, specific details about exploitation and impact are limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-102489 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-102489

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-102489 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-102489

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.