CVE-2026-84464 Zammad: IDOR in External Data Source rendering exposes ticket, user, group, and organization data
Authenticated users can view unauthorized ticket, user, group, and organization data via IDOR in External Data Source rendering.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84464?
CVE-2026-84464 is a high-severity missing authorization vulnerability in zammad, published on 25 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, zammad's External Data Source feature, used to look up records from an external system, did not properly verify whether a user was allowed to see a specific ticket, user, group, or organization before including its details in a request to that external system. An authenticated user, including one with only basic customer access, could exploit this by referencing another record's ID, and thereby view details of tickets, customer accounts, teams, or organizations that did not belong to them. This issue is fixed in version 7.1.2.
Which versions are affected by CVE-2026-84464?
How do I fix CVE-2026-84464?
No fix has been published for CVE-2026-84464 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-84464 being exploited?
There is no known exploitation of CVE-2026-84464 in the wild and no public exploit code.
Sources
Also known as GHSA-jvm2-cr58-4qxp.