{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "1.0.0"
              },
              {
                "fixed": "3.4.1"
              }
            ]
          },
          "events": [
            {
              "introduced": "9bdf6d7b816d4e55501e13d12dc0d9b53cf16f5c"
            },
            {
              "fixed": "a12d45896b1518190fe00a120d6b92f8c29f1f54"
            }
          ],
          "repo": "https://github.com/zammad/zammad",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "An issue was discovered in Zammad before 3.4.1. There is an authentication bypass in the SSO endpoint via a crafted header, when SSO is not configured. An attacker can create a valid and authenticated session that can be used to perform any actions in the name of other users.",
  "id": "CVE-2020-26030",
  "modified": "2026-03-13T21:46:56.435215388Z",
  "published": "2020-12-28T08:15:11.257Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://zammad.com/news/security-advisory-zaa-2020-18"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}