{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "26.0.1"
              },
              {
                "fixed": "26.0.25"
              },
              {
                "introduced": "0"
              },
              {
                "fixed": "6.8.165"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "3c64605e5d45b524915be331b2de97cd04858cb6"
            },
            {
              "fixed": "a96e2bc3524c79fa595b59e3d0a819940a833a59"
            },
            {
              "introduced": "0"
            },
            {
              "fixed": "01515845fe2807c2394ef5f89fd2df2e61a68443"
            }
          ],
          "repo": "https://github.com/intermesh/groupoffice",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9w92-p32g-g99p"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639",
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45551.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "25.0.1"
          },
          {
            "fixed": "25.0.1005"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Group-Office is an enterprise customer relationship management and groupware tool. Prior to 26.0.25, 25.0.100, and 6.8.165, GroupOffice allows authenticated users to persist arbitrary legacy settings for any user_id via index.php?r=core/saveSetting. A separate client-side sink in the email module injects the email_font_size setting directly into JavaScript without escaping. By combining these two issues, any low-privileged authenticated user can overwrite an administrator's email_font_size setting with a JavaScript payload and trigger stored XSS in the administrator's browser when the GroupOffice web client loads views/Extjs3/modulescripts.php. This vulnerability is fixed in 26.0.25, 25.0.100, and 6.8.165.",
  "id": "CVE-2026-45551",
  "modified": "2026-08-12T03:51:46.660128459Z",
  "published": "2026-05-29T12:34:22.615Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45551.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45551"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Group-Office: Authenticated Stored XSS in Administrator Context via Arbitrary Cross-User Setting Write"
}