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CVE-2026-22689— Mailpit is vulnerable to Cross-Site WebSocket Hijacking (CSWSH) allowing unauthenticated access to emails

Quick assessment

Affected
axllent mailpit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mailpit是Ralph Slooten个人开发者的一个电子邮件测试工具。 Mailpit 1.28.2之前版本存在安全漏洞，该漏洞源于WebSocket服务器缺少Origin标头验证，可能导致跨站WebSocket劫持和数据泄露。

CVSS 6.5 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-22689

Vulnerability Information
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Vulnerability Title
Mailpit is vulnerable to Cross-Site WebSocket Hijacking (CSWSH) allowing unauthenticated access to emails
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1385
Source: CVE Program / CVE List V5
Vulnerability Title
Mailpit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mailpit是Ralph Slooten个人开发者的一个电子邮件测试工具。 Mailpit 1.28.2之前版本存在安全漏洞，该漏洞源于WebSocket服务器缺少Origin标头验证，可能导致跨站WebSocket劫持和数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
axllent mailpit < 1.28.2 -

II. Public POCs for CVE-2026-22689

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III. Intelligence Information for CVE-2026-22689

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Vendor Advisories for CVE-2026-22689 (1)

IV. Related Vulnerabilities

Same product: mailpit
Same vendor: axllent
Same weakness: CWE-1385

V. Comments for CVE-2026-22689

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