{"id":"CVE-2026-86813","aliases":["EUVD-2026-76041","GHSA-687m-wfrp-8mxf"],"status":"published","title":"MetForm \u003c 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To","description":"The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted field value is configured to populate a header.","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00243,"percentile":0.15623,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-93"],"published":"2026-09-11T10:56:37Z","modified":"2026-09-11T17:35:21Z","products":[{"vendor":"unknown","product":"metform"},{"vendor":"xpeedstudio","product":"metform"}],"references":[{"url":"https://wpscan.com/vulnerability/afda2a26-b965-42cb-85a8-4a4d83ec026e/","tags":["exploit","vdb-entry","technical-description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86813"},{"url":"https://wpscan.com/vulnerability/afda2a26-b965-42cb-85a8-4a4d83ec026e"},{"url":"https://github.com/advisories/GHSA-687m-wfrp-8mxf"}],"sources":{"cve":[{"id":"CVE-2026-86813","title":"MetForm \u003c 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To","description":"The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted field value is configured to populate a header.","status":"published","published":"2026-09-11T10:56:37.49Z","modified":"2026-09-11T12:06:35.387Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-93"],"updated_at":"2026-11-02T13:49:42.666099Z"}],"euvd":[{"id":"EUVD-2026-76041","description":"The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted field value is configured to populate a header.","status":"published","published":"2026-09-11T10:56:37Z","modified":"2026-09-11T12:06:35Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T17:28:22.994693Z"}],"ghsa":[{"id":"GHSA-687m-wfrp-8mxf","title":"The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user...","description":"The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted field value is configured to populate a header.","status":"published","published":"2026-09-11T12:33:25Z","modified":"2026-09-11T15:32:40Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-93"],"updated_at":"2026-11-02T15:11:44.427999Z"}],"nvd":[{"id":"CVE-2026-86813","description":"The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted field value is configured to populate a header.","status":"published","published":"2026-09-11T11:16:57.267Z","modified":"2026-09-11T17:35:21.44Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-93"],"updated_at":"2026-11-02T14:12:46.271848Z"}]}}