{"id":"CVE-2026-56728","summary":"Zammad: Cross-User Taskbar Item Access Control Vulnerability","details":"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.","aliases":["GHSA-jvcg-5539-vvc3"],"modified":"2026-09-27T03:47:27.426288868Z","published":"2026-09-25T17:10:16.262Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-200","CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56728.json"},"references":[{"type":"WEB","url":"https://github.com/zammad/zammad/releases/tag/7.0.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56728.json"},{"type":"ADVISORY","url":"https://github.com/zammad/zammad/security/advisories/GHSA-jvcg-5539-vvc3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56728"},{"type":"FIX","url":"https://github.com/zammad/zammad/commit/4ccd5d573023b66b0d0184914c92417e1780793f"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zammad/zammad","events":[{"introduced":"0"},{"fixed":"4ccd5d573023b66b0d0184914c92417e1780793f"},{"fixed":"9dc15acf239dbc32ec357708859f2d86b188846c"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"7.0.2"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["7.0.1","7.0.0","7.0.0-alpha","6.6.0-alpha","6.5.0-alpha","6.4.0-alpha","6.3.0-alpha","6.2.0-alpha","6.1.0-alpha","6.0.0-alpha","5.5.0-alpha","5.4.0-alpha","5.3.0-alpha","5.2.0-alpha","3.7.0","1.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56728.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}