{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23845","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-01-16T15:46:40.842Z","datePublished":"2026-01-19T19:01:38.163Z","dateUpdated":"2026-01-20T20:05:35.862Z"},"containers":{"cna":{"title":"Mailpit Vulnerable to Server-Side Request Forgery (SSRF) via HTML Check API","problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j"},{"name":"https://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe"},{"name":"https://github.com/axllent/mailpit/releases/tag/v1.28.3","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/releases/tag/v1.28.3"}],"affected":[{"vendor":"axllent","product":"mailpit","versions":[{"version":"< 1.28.3","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-01-19T19:01:38.163Z"},"descriptions":[{"lang":"en","value":"Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel=\"stylesheet\" href=\"...\">` tags to inline them for testing. Version 1.28.3 fixes the issue."}],"source":{"advisory":"GHSA-6jxm-fv7w-rw5j","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-20T20:04:04.082622Z","id":"CVE-2026-23845","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-01-20T20:05:35.862Z"}}]}}