CVE-2026-65828 Zammad: Pending upload deletion bypass via legacy attachment endpoint
An authenticated attacker can delete other users' pending file uploads by exploiting a missing ownership check in the legacy attachment endpoint.
- 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-2026-65828?
CVE-2026-65828 is a low-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, the legacy destroy_form action on AttachmentsController deletes UploadCache Store records based solely on a user-supplied form_id without verifying that the requesting user owns those records. An authenticated attacker who learns another user's pending-upload UUID can silently remove temporary file uploads before the victim submits their ticket or article. This issue is fixed in version 7.1.2.
Weakness: CWE-862
Which versions are affected by CVE-2026-65828?
How do I fix CVE-2026-65828?
No fix has been published for CVE-2026-65828 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-2026-65828 being exploited?
There is no known exploitation of CVE-2026-65828 in the wild and no public exploit code.
Sources
Also known as GHSA-x4f3-367g-m93g.