{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "7.0.2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4ccd5d573023b66b0d0184914c92417e1780793f"
            },
            {
              "fixed": "9dc15acf239dbc32ec357708859f2d86b188846c"
            }
          ],
          "repo": "https://github.com/zammad/zammad",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jvcg-5539-vvc3"
  ],
  "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"
  },
  "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.",
  "id": "CVE-2026-56728",
  "modified": "2026-09-27T03:31:01.258070880Z",
  "published": "2026-09-25T17:10:16.262Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Zammad: Cross-User Taskbar Item Access Control Vulnerability"
}