CVE-2026-65828Zammad: Pending upload deletion bypass via legacy attachment endpoint

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/zammad/zammad/security/advisories/GHSA-x4f3-367g-m93g
• https://github.com/zammad/zammad/commit/3b755736fdbee8ff6ddf53661d6912d3d3028325