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CVE-2026-56728

Zammad: Cross-User Taskbar Item Access Control Vulnerability

MEDIUM
5.3
CVSS Score
Published: September 25, 2026 at 05:10 PM UTC
Updated: September 28, 2026 at 02:45 PM UTC
1 product affected across 1 vendorZammad

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zammad· Zammad
60%
v < 7.0.2
Affected range stops below 7.0.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/zammad/zammad/security/advisories/GHSA-jvcg-5539-vvc3
x_refsource_MISC
Source: cverecord
https://github.com/zammad/zammad/commit/4ccd5d573023b66b0d0184914c92417e1780793f
x_refsource_MISC
Source: cverecord
https://github.com/zammad/zammad/releases/tag/7.0.2

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-200CWE-639

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