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CVE-2026-22689
Good to know:
Date: January 10, 2026
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.
Severity Score
Related Resources (5)
Severity Score
Weakness Type (CWE)
Missing Origin Validation in WebSockets
CWE-1385Top Fix
Upgrade Version
Upgrade to version github.com/axllent/mailpit - v1.28.2;github.com/axllent/mailpit - v1.28.2;https://github.com/axllent/mailpit.git - v1.28.2
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | REQUIRED |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | HIGH |
| Integrity (I): | NONE |
| Availability (A): | NONE |