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CVE-2026-56726— Zammad: Missing authorization check in GitHub + GitLab integration allows cross-ticket data leak

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 的开源客服/客户支持系统。在版本 7.0.2 之前，该漏洞会破坏代理（Agent）之间正常的工单隔离边界。任何已认证的代理用户，即使当前没有分配活跃工单，也可以查看系统中任意工单所关联的 GitHub/GitLab 问题的标题、状态、标签和 URL 链接。这使得内部用户能够通过简单查询随机或连续的工单 ID，系统地浏览由组织内其他代理或管理员链接的 GitHub/GitLab 问题数据。该漏洞已在版本 7.0.2 中修复。

CVSS 5.1 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
zammad zammad < 7.0.2 affected
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I. Basic Information for CVE-2026-56726

Vulnerability Information
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Vulnerability Title
Zammad: Missing authorization check in GitHub + GitLab integration allows cross-ticket data leak
Source: CVE Program / CVE List V5
Vulnerability Description
Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, this vulnerability breaks normal ticket isolation boundaries between agents. Any authenticated agent, even one with no active tickets assigned to them, can view the titles, status, labels, and URL links of GitHub/GitLab issues attached to any ticket in the system. This allows an internal user to systematically view GitHub/GitLab issue data linked by other agents or administrators across the organization by simply querying random or sequential ticket IDs. This vulnerability is fixed in 7.0.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/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

Vendor Product Affected Versions CPE Subscribe
zammad zammad < 7.0.2 -

II. Public POCs for CVE-2026-56726

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III. Intelligence Information for CVE-2026-56726

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Patches & Fixes for CVE-2026-56726 (2)

Vendor Advisories for CVE-2026-56726 (1)

Vendor Pages for CVE-2026-56726 (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-2026-56734 5.3 MEDIUM Zammad: Avatar Image URL Server-Side Request Forwarding
CVE-2026-56732 5.3 MEDIUM Zammad: Malicious input in Ticket Body Enables Session Termination
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 &rarr; →

IV. Related Vulnerabilities

Same product: zammad
Same vendor: zammad
Same weakness: CWE-862

V. Comments for CVE-2026-56726

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