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2.3
CVE-2026-65828: Zammad lets attackers delete other users' pending uploads
CVE-2026-65828 · published 24 days ago
Summary
In Zammad versions before 7.1.2, a web request could remove a temporary file that another user had uploaded, without checking ownership. An attacker who knows the other person's upload identifier can erase those files before the ticket is submitted, potentially causing loss of information. Upgrade to Zammad 7.1.2 or later to stop this behavior.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| zammad | zammad | < 7.1.2 |
Original advisory text
Zammad: Pending upload deletion bypass via legacy attachment endpoint
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.
References
- https://github.com/zammad/zammad/commit/3b755736fdbee8ff6ddf53661d6912d3d3028325
- https://github.com/zammad/zammad/security/advisories/GHSA-x4f3-367g-m93g
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65828... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-65828 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Type
CWE-862Missing Authorization
Timeline
Published25 Sep 2026
Updated19 Oct 2026
First seen25 Sep 2026
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