{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "99eb6d4586134bf3f4422093fbf47d6794ef0ee5"
            }
          ],
          "repo": "https://github.com/maalfer/mailerup",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Secur0",
    "cwe_ids": [
      "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13163.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "1.0.1"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "1.0.1"
          }
        ],
        "source": "CPE_FIELD"
      }
    ]
  },
  "details": "Open redirect vulnerability (CWE-601) in the _safe_redirect function of the click-tracking endpoint (/c/\u003ctoken\u003e/) in Mailerup \u003c1.0.0 on all platforms allows remote unauthenticated attackers to redirect victims to arbitrary external sites and conduct phishing attacks via a crafted u query parameter, because the URL scheme is validated (blocking javascript: and data:) but the destination host is not restricted to an allowlist, and a signing.BadSignature exception is silently caught so a valid signed token is not required.",
  "id": "CVE-2026-13163",
  "modified": "2026-07-15T01:48:52.335191513Z",
  "published": "2026-06-24T12:49:05.227Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13163.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13163"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Maalfer/mailerup/commit/99eb6d4586134bf3f4422093fbf47d6794ef0ee5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Maalfer/mailerup"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Lack of input validation in Mailerup input parameter leads to Open Redirect"
}