{"id":"CVE-2026-40567","state":"PUBLISHED","title":"FreeScout has HTML Injection in Outgoing Emails via Unsanitized Customer Name in Signature Variables","description":"FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, an unauthenticated attacker can inject arbitrary HTML into outgoing emails generated by FreeScout by sending an email with a crafted From display name. The name is stored in the database without sanitization and rendered unescaped into outgoing reply emails via the `{%customer.fullName%}` signature variable. This allows embedding phishing links, tracking pixels, and spoofed content inside legitimate support emails sent from the organization's address. Version 1.8.213 fixes the issue.","publishedAt":"2026-04-21T16:06:39.878Z","updatedAt":"2026-04-21T19:17:33.873Z","severity":{"score":5.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["freescout-help-desk freescout"],"affected":[{"vendor":"freescout-help-desk","product":"freescout","versions":[{"version":"< 1.8.213","status":"affected"}]}],"references":["https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-q8v4-v62h-5528","https://github.com/freescout-help-desk/freescout/commit/9131b16f80eade81002cb9809a2603f6b61981cf","https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213"],"weaknesses":["CWE-116"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40567.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40567","state":"PUBLISHED","datePublished":"2026-04-21T16:06:39.878Z","dateUpdated":"2026-04-21T19:17:33.873Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-14T13:24:29.474Z"},"containers":{"cna":{"title":"FreeScout has HTML Injection in Outgoing Emails via Unsanitized Customer Name in Signature Variables","descriptions":[{"lang":"en","value":"FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, an unauthenticated attacker can inject arbitrary HTML into outgoing emails generated by FreeScout by sending an email with a crafted From display name. The name is stored in the database without sanitization and rendered unescaped into outgoing reply emails via the `{%customer.fullName%}` signature variable. This allows embedding phishing links, tracking pixels, and spoofed content inside legitimate support emails sent from the organization's address. Version 1.8.213 fixes the issue."}],"affected":[{"vendor":"freescout-help-desk","product":"freescout","versions":[{"version":"< 1.8.213","status":"affected"}]}],"references":[{"url":"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-q8v4-v62h-5528","name":"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-q8v4-v62h-5528","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/freescout-help-desk/freescout/commit/9131b16f80eade81002cb9809a2603f6b61981cf","name":"https://github.com/freescout-help-desk/freescout/commit/9131b16f80eade81002cb9809a2603f6b61981cf","tags":["x_refsource_MISC"]},{"url":"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213","name":"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-116","lang":"en","description":"CWE-116: Improper Encoding or Escaping of Output","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-21T16:06:39.878Z"},"source":{"advisory":"GHSA-q8v4-v62h-5528","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-q8v4-v62h-5528","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-21T19:17:14.445574Z","id":"CVE-2026-40567","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-21T19:17:33.873Z"}}]}}}