{"id":"CVE-2026-67448","title":"Mailpit is an email testing tool and API for developers","summary":"Mailpit is an email testing tool and API for developers. From 1.29.0 until 1.30.6, Mailpit's server/server.go origin middleware checks the raw RequestURI for the /api/ prefix while Go's ServeMux routes using the percent-decoded URL path,…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","cwe":["CWE-177","CWE-200","CWE-346"],"vendor":"axllent","product":"github.com/axllent/mailpit","affected":["github.com/axllent/mailpit >= 1.29.0, <= 1.30.5"],"patched":["github.com/axllent/mailpit 1.30.6"],"published":"2026-08-20","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67448","references":[{"url":"https://github.com/axllent/mailpit/commit/fbe5e006c3f1682b819df58b4a932d7a84920be9","label":"security-advisories@github.com"},{"url":"https://github.com/axllent/mailpit/releases/tag/v1.30.6","label":"security-advisories@github.com"},{"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-8r62-w5wh-fc5m","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-8r62-w5wh-fc5m"}],"tags":["nvd","ghsa","go"],"epss":0.00146,"epssPercentile":0.04272,"aliases":["GHSA-8r62-w5wh-fc5m"],"ecosystem":"go","ingestedAt":"2026-08-20T22:02:20.977Z","slug":"CVE-2026-67448","body":"## Overview\n\nMailpit is an email testing tool and API for developers. From 1.29.0 until 1.30.6, Mailpit's server/server.go origin middleware checks the raw RequestURI for the /api/ prefix while Go's ServeMux routes using the percent-decoded URL path, and server/websockets/client.go configures websocket.Upgrader.CheckOrigin to return true. A malicious website can request /%61pi/events, skip corsOriginAccessControl(), reach the /api/events WebSocket handler, and receive live message IDs, Message-Id values, sender and recipient fields, subjects, tags, and body snippets from an unauthenticated default Mailpit instance after the user visits the site. This is a regression of the earlier WebSocket origin protection and does not affect deployments protected by --ui-auth-file. This issue is fixed in version 1.30.6.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-67448)\n\nAffected packages:\n\n- `github.com/axllent/mailpit >= 1.29.0, <= 1.30.5`\n\nPatched in:\n\n- `github.com/axllent/mailpit 1.30.6`\n\nSource: https://github.com/advisories/GHSA-8r62-w5wh-fc5m","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}