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Zammad 5.3.x (Fixed 5.4.0) is vulnerable to Incorrect Access Control. An authenticated attacker could gain information about linked accounts of users involved in their tickets using the Zammad API.
Cite this page
CVE-2023-29867. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2023-29867
Use CWE-346, Zammad vendor hub and Zammad product page to widen CVE-2023-29867 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-34724, CVE-2026-34723 and CVE-2026-34719 for nearby disclosures in the same product family.