Zammad Session Leak Flaw CVE-2026-102489 Enables Remote Code Execution

A vulnerability in the Zammad customer support platform allows attackers to leak session data and execute remote code, according to a community analysis.

Threat Times Exposure DeskOctober 9, 20261 min read

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Illustration: A sleek helpdesk application interface displays a blank dashboard. — AI-generated illustration: Threat Times

Key points

The vulnerability is identified as CVE-2026-102489.
It allows for session leakage which can lead to remote code execution.
The analysis was submitted by user /u/scopedsecurity on r/netsec.

A security researcher has detailed a vulnerability in the Zammad customer support platform that allows for session leakage and subsequent remote code execution. The flaw, identified as CVE-2026-102489, was the subject of a deep-dive analysis submitted by user /u/scopedsecurity to the r/netsec community.

According to the report shared on the platform, the vulnerability enables an attacker to leak session information. This initial access vector can be leveraged to achieve remote code execution (RCE) on the affected system. The analysis highlights the severity of the chain, moving from data exposure to full system control.

Technical Context

The submission on r/netsec serves as the primary source for these details. The report is categorized as a deep-dive, suggesting a detailed examination of the exploit chain. The specific mechanism involves the leakage of session tokens or data, which are then used to escalate privileges or execute arbitrary commands. The vulnerability is tracked under the identifier CVE-2026-102489. No additional technical specifications, such as CVSS scores or specific code snippets, were provided in the brief summary.

Affected Systems

The vulnerability affects the Zammad platform. Zammad is a widely used open-source customer support and helpdesk solution. Organizations utilizing Zammad for ticketing and customer interaction may be exposed to this threat if their installations have not been patched. The report does not specify which versions of Zammad are vulnerable or if a fix has been released. Consequently, administrators must assume their systems are at risk until they can verify the status of their specific installation against vendor advisories.

What should you do?

Security professionals managing Zammad instances should immediately check for official vendor updates regarding CVE-2026-102489. If no patch is available, organizations should consider isolating the affected systems from untrusted networks. Administrators should review access logs for signs of session hijacking or unusual command execution. Monitoring for unexpected outbound connections or new user creation can help detect exploitation attempts.

What to do and how to stay safe: Zammad

Verify the version of Zammad currently in use and check the vendor’s security advisories for a patch related to CVE-2026-102489.
Monitor server logs for anomalies such as unexpected session terminations, privilege escalations, or commands executed by unexpected users.
Restrict network access to the Zammad application interface to trusted IP addresses only to limit the attack surface.
Once the vendor provides an update, apply it promptly to mitigate the risk of remote code execution.

Step-by-step guide: Risk Based Vulnerability Management: Prioritize Fixes by Actual Threat

General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.