CVE-2026-65828— Zammad: Pending upload deletion bypass via legacy attachment endpoint
Quick assessment
Affected
zammad zammad
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Zammad 是一个基于 Web 的开源帮助台/客户支持系统。在 7.1.2 版本之前，AttachmentsController 中的废弃的 destroy_form 操作在删除 UploadCache Store 记录时，仅依赖用户提供的 form_id，而未验证请求用户是否拥有这些记录。已认证的攻击者如果获悉其他用户待上传文件的 UUID，便可以在受害者提交工单或文章之前，静默删除其临时文件上传。此问题已在 7.1.2 版本中修复。
Possible ATT&CK Techniques 2 AI
T1530 · Data from Cloud Storage T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2026-65828
Vulnerability Information
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Vulnerability Title
Zammad: Pending upload deletion bypass via legacy attachment endpoint
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-65828
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-65828 (1)
Vendor Advisories for CVE-2026-65828 (1)
Same Patch Batch · zammad · 2026-09-25 · 30 CVEs total
| CVE-2026-84458 | 9.1 CRITICAL | Zammad: Account takeover via unverified email matching during SSO auto-link |
| CVE-2026-61525 | 8.8 HIGH | Zammad: Arbitrary File Deletion via Unvalidated Session Identifier in Long Polling Control |
| CVE-2026-56733 | 8.7 HIGH | Zammad: Incorrect Authorization and Improper Privilege Management |
| CVE-2026-56725 | 8.7 HIGH | Zammad: Denial of Service via OTRS Import Controller |
| CVE-2026-84462 | 8.6 HIGH | Zammad: AI Agent template sanitizer bypass leads to remote code execution |
| CVE-2026-56731 | 8.4 HIGH | Zammad: Cross-Site Scripting in Ticket Notifications |
| CVE-2026-56724 | 7.1 HIGH | Zammad: Incorrect implementation of permission checks in the knowledge base module |
| CVE-2026-84465 | 7.1 HIGH | Zammad: S/MIME signature verification allows forged sender impersonation |
| CVE-2026-84464 | 7.1 HIGH | Zammad: IDOR in External Data Source rendering exposes ticket, user, group, and organizati |
| CVE-2026-56727 | 7.1 HIGH | Zammad: PGP signature spoofing via unvalidated verification return |
| CVE-2026-56723 | 7.1 HIGH | Zammad: Missing authorization on ticket attachment download |
| CVE-2026-84461 | 6.9 MEDIUM | Zammad: Missing rate limiting allows password brute-forcing during two-factor login |
| CVE-2026-63207 | 6.9 MEDIUM | Zammad: Sensitive Information Exposure in Integration Administration API |
| CVE-2026-84463 | 6.3 MEDIUM | Zammad: Stored HTML injection in Knowledge Base video widget enables forced session switch |
| CVE-2026-56735 | 5.3 MEDIUM | Zammad: Improper neutralization of `srcset` attribute in IMG tags in Zammad |
| CVE-2026-56728 | 5.3 MEDIUM | Zammad: Cross-User Taskbar Item Access Control Vulnerability |
| CVE-2026-63206 | 5.3 MEDIUM | Zammad: Remote image tracking bypass via shortened URL scheme |
| CVE-2026-56732 | 5.3 MEDIUM | Zammad: Malicious input in Ticket Body Enables Session Termination |
| CVE-2026-56734 | 5.3 MEDIUM | Zammad: Avatar Image URL Server-Side Request Forwarding |
| CVE-2026-84460 | 5.3 MEDIUM | Zammad: Missing Authorization in TagsController#list Allows Cross-Object Tag Enumeration |
Showing top 20 of 30 CVEs. View all on vendor page → →
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Same weakness: CWE-862
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V. Comments for CVE-2026-65828
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