# CVE-2026-67448

## Summary

- **CVE ID:** CVE-2026-67448
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (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
- **Published:** Aug 20, 2026
- **Last Modified:** Aug 21, 2026

## 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.

## Affected Products

- axllent — mailpit (>= 1.29.0, < 1.30.6)

## References

- [CNA](https://github.com/axllent/mailpit/security/advisories/GHSA-8r62-w5wh-fc5m)
- [CNA](https://github.com/axllent/mailpit/commit/fbe5e006c3f1682b819df58b4a932d7a84920be9)
- [CNA](https://github.com/axllent/mailpit/releases/tag/v1.30.6)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._