{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.0.0"
                  },
                  {
                    "fixed": "2.13.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          "events": [
            {
              "introduced": "492f6346849fb9bc5cdca5fb9cd88ae24c296fd7"
            },
            {
              "fixed": "4caf0a64a4d4b1b2756ea05e3883aacac16babc2"
            }
          ],
          "repo": "https://github.com/cypht-org/cypht",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113583.json"
  },
  "details": "Cypht webmail 2.0.0 through 2.12.2 contains a DOM-based cross-site scripting vulnerability that allows remote attackers to execute arbitrary JavaScript by crafting malicious alt text or URL values in an HTML email's external image tag when ALLOW_EXTERNAL_IMAGE_SOURCES is enabled. Attackers can send a specially crafted email so that when the victim opens it, the externalResources.js code builds the blocked-image notice using innerHTML with decoded email-derived values, triggering script execution in the victim's authenticated session to read mailboxes, send email, or change settings.",
  "id": "CVE-2026-113583",
  "modified": "2026-10-23T10:30:48.994225394Z",
  "published": "2026-10-20T11:35:29.543Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113583.json"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cypht-org/cypht"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cypht-org/cypht/pull/2118/changes/75d2fb83d228be2aaa37036a11eea68d82122d85"
    },
    {
      "type": "FIX",
      "url": "https://github.com/cypht-org/cypht/releases#release-v2.13.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113583"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/cypht-through-stored-dom-xss-via-externalresources-js"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Cypht 2.0.0 through 2.12.2 Stored DOM XSS via externalResources.js"
}