{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45125",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-18T17:44:38.156362Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-18T17:46:25.763Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mybb",
          "vendor": "mybb",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.8.40"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "MyBB is free and open source forum software. Prior to 1.8.40, the Email User controller does not sanitize sender names correctly, resulting in mail header injection. member.php?action=do_emailuser accepts the fromname HTTP parameter for guests or the stored username for authenticated users when the cansendemail group permission is enabled. When mail_handler is set to the default PHP mail value, the sender name is used without sanitization in Return-Path and Reply-To headers, allowing arbitrary headers to be injected with CRLF sequences. This issue is fixed in version 1.8.40."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-93",
              "description": "CWE-93: Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T15:50:38.936Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/mybb/mybb/security/advisories/GHSA-f626-53q9-pqm9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/mybb/mybb/security/advisories/GHSA-f626-53q9-pqm9"
        },
        {
          "name": "https://github.com/mybb/mybb/commit/5046c56b515d4593297a4f65b0c6ccb0b55baa01",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mybb/mybb/commit/5046c56b515d4593297a4f65b0c6ccb0b55baa01"
        },
        {
          "name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
        },
        {
          "name": "https://mybb.com/versions/1.8.40",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://mybb.com/versions/1.8.40"
        }
      ],
      "source": {
        "advisory": "GHSA-f626-53q9-pqm9",
        "discovery": "UNKNOWN"
      },
      "title": "MyBB: Email User CRLF injection"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45125",
    "datePublished": "2026-08-18T15:50:38.936Z",
    "dateReserved": "2026-05-08T20:08:17.208Z",
    "dateUpdated": "2026-08-18T17:46:25.763Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}