{"id":"CVE-2026-86813","state":"PUBLISHED","title":"MetForm < 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.","publishedAt":"2026-09-11T10:56:37.490Z","updatedAt":"2026-09-11T12:06:35.387Z","severity":{"score":4.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","source":"WPScan"},"assigner":"WPScan","products":["Unknown MetForm"],"affected":[{"vendor":"Unknown","product":"MetForm","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.1.9","versionType":"semver"}],"collectionURL":"https://wordpress.org/plugins"}],"references":["https://wpscan.com/vulnerability/afda2a26-b965-42cb-85a8-4a4d83ec026e/"],"weaknesses":["CWE-93"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/86xxx/CVE-2026-86813.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-86813","state":"PUBLISHED","datePublished":"2026-09-11T10:56:37.490Z","dateUpdated":"2026-09-11T12:06:35.387Z","assignerShortName":"WPScan","assignerOrgId":"1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81","dateReserved":"2026-09-08T13:37:59.083Z"},"containers":{"cna":{"title":"MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Unknown","product":"MetForm","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.1.9","versionType":"semver"}],"collectionURL":"https://wordpress.org/plugins"}],"references":[{"url":"https://wpscan.com/vulnerability/afda2a26-b965-42cb-85a8-4a4d83ec026e/","tags":["exploit","vdb-entry","technical-description"]}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","baseScore":4.8,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"description":"CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"WPScan","orgId":"1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81","dateUpdated":"2026-09-11T10:56:37.490Z"},"credits":[{"lang":"en","value":"Artus KG","type":"finder"},{"lang":"en","value":"WPScan","type":"coordinator"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"WPScan CVE Generator"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-11T12:05:38.615469Z","id":"CVE-2026-86813","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-93","type":"CWE","lang":"en","description":"CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-11T12:06:35.387Z"}}]}}}