Vulnerability Description
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, 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/axllent/mailpit/commit/fbe5e006c3f1682b819df58b4a932d7a84920b
- https://github.com/axllent/mailpit/releases/tag/v1.30.6
- https://github.com/axllent/mailpit/security/advisories/GHSA-8r62-w5wh-fc5m
FAQ
What is CVE-2026-67448?
CVE-2026-67448 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 route...
How severe is CVE-2026-67448?
CVE-2026-67448 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67448?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.