Zammad GmbH Zammad Session Fixation Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 02/10/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| zammad | ≥ 6.3.0, ≤ 6.5.4 |
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.
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