CVE-2026-102489 Zammad - Session Hijacking & Remote Code Execution

Zammad 6.3.0 to 6.5.4 contains a session hijack vulnerability caused by improper session management, letting remote attackers execute code as the zammad user, exploit requires vulnerable version and session hijack.

CVSS base score 9.8 /10
Critical
CISA KEV
Exploited in the wild
Public exploit
Proof of concept available
Authentication
Not required
EPSS
1.26% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Session Hijacking
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-384

Vendor fix

Update to a version later than 6.5.4 or 7.1.3 where the vulnerability is not exploitable.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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