Vulnerability Description
Mailpit is an email testing tool and API for developers. Prior to version 1.28.2, the Mailpit WebSocket server is configured to accept connections from any origin. This lack of Origin header validation introduces a Cross-Site WebSocket Hijacking (CSWSH) vulnerability. An attacker can host a malicious website that, when visited by a developer running Mailpit locally, establishes a WebSocket connection to the victim's Mailpit instance (default ws://localhost:8025). This allows the attacker to intercept sensitive data such as email contents, headers, and server statistics in real-time. This issue has been patched in version 1.28.2.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Axllent | Mailpit | < 1.28.2 |
Related Weaknesses (CWE)
References
- https://github.com/axllent/mailpit/commit/6f1f4f34c98989fd873261018fb73830b30aecPatch
- https://github.com/axllent/mailpit/security/advisories/GHSA-524m-q5m7-79mmExploitMitigationVendor Advisory
FAQ
What is CVE-2026-22689?
CVE-2026-22689 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Mailpit is an email testing tool and API for developers. Prior to version 1.28.2, the Mailpit WebSocket server is configured to accept connections from any origin. This lack of Origin header validatio...
How severe is CVE-2026-22689?
CVE-2026-22689 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-2026-22689?
Check the references section above for vendor advisories and patch information. Affected products include: Axllent Mailpit.