SecuriTricks - CVE-2026-22689

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.

Product(s) Impacted

Vendor	Product	Versions
Mailpit	Mailpit	<1.28.2

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-1385

Missing Origin Validation in WebSockets

The product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	mailpit	mailpit	<1.28.2	/	/	/	/	/	/	/

References

https://github.com/axllent/mailpit/commit/6f1f4f34c98989fd873261018fb73830b30aec3f

https://github.com/axllent/mailpit/security/advisories/GHSA-524m-q5m7-79mm

CVSS Score

6.5 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: NONE
Availability Impact: NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

View Vector String

Timeline

Published: Jan. 10, 2026, 6:15 a.m.
Last Modified: Jan. 10, 2026, 6:15 a.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

security-advisories@github.com

CVE-2026-22689