CVE-2026-84464

Zammad: IDOR in External Data Source rendering exposes ticket, user, group, and organization data

State: Published
Severity: 7.1 High
Published: Sep 25, 2026
Updated: Sep 25, 2026
Reserved: Sep 1, 2026

Description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, zammad's External Data Source feature, used to look up records from an external system, did not properly verify whether a user was allowed to see a specific ticket, user, group, or organization before including its details in a request to that external system. An authenticated user, including one with only basic customer access, could exploit this by referencing another record's ID, and thereby view details of tickets, customer accounts, teams, or organizations that did not belong to them. This issue is fixed in version 7.1.2.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-639 Authorization Bypass Through User-Controlled Key
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
zammadzammad	< 7.1.2Affected

References

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