---
id: CVE-2026-56728
title: Zammad is a web based open source helpdesk/customer support system
summary: >-
  Zammad is a web based open source helpdesk/customer support system. Prior to
  7.0.2, a broken access control vulnerability exists in Zammad's GraphQL API.
  An authenticated user can access taskbar item data belonging to another user
  by cra…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-200
  - CWE-639
vendor: zammad
product: zammad
affected:
  - zammad < 7.0.2
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:17:42.760'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56728'
references:
  - url: >-
      https://github.com/zammad/zammad/commit/4ccd5d573023b66b0d0184914c92417e1780793f
    label: security-advisories@github.com
  - url: 'https://github.com/zammad/zammad/releases/tag/7.0.2'
    label: security-advisories@github.com
  - url: 'https://github.com/zammad/zammad/security/advisories/GHSA-jvcg-5539-vvc3'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-25T18:38:13.258499Z'
cvssSource: cna
ingestedAt: '2026-09-25T18:14:20.464Z'
---

## Overview

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, a broken access control vulnerability exists in Zammad's GraphQL API. An authenticated user can access taskbar item data belonging to another user by crafting a request with the target user's taskbar identifier. The taskbar feature stores transient state for active user sessions, including auto-saved ticket drafts. Under certain conditions, the authorization check for taskbar item access is not enforced, allowing a user to read another user's taskbar item data. This vulnerability is fixed in 7.0.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.