PT-2026-2243 · Mailpit · Mailpit

Omarkurt · Published 2026-01-10 · Updated 2026-02-18 · CVE-2026-22689

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mailpit versions prior to 1.28.2

Description Mailpit, an email testing tool and API for developers, contains a Cross-Site WebSocket Hijacking (CSWSH) issue in its WebSocket server. The server, in versions prior to 1.28.2, does not validate the Origin header, allowing an attacker to establish a WebSocket connection to a developer’s Mailpit instance. This connection, established through a malicious website visited by a developer running Mailpit locally, enables the attacker to intercept sensitive data in real-time, including email contents, headers, and server statistics. The default WebSocket endpoint is ws://localhost:8025.

Recommendations Update Mailpit to version 1.28.2 or later.

Exploit

Fix

Weakness Enumeration

CWE-1385

Related Identifiers

CVE-2026-22689

GHSA-524M-Q5M7-79MM

GO-2026-4310

SUSE-SU-2026:0292-1

Affected Products

Mailpit

References · 32

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22689.json · Exploit
• https://github.com/axllent/mailpit/commit/6f1f4f34c98989fd873261018fb73830b30aec3f · Patch
• https://github.com/axllent/mailpit/security/advisories/GHSA-524m-q5m7-79mm · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-22689 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-22689 · Security Note
• https://osv.dev/vulnerability/GHSA-524m-q5m7-79mm · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4310 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0292-1 · Vendor Advisory
• https://github.com/axllent/mailpit · Note
• https://suse.com/security/cve/CVE-2026-22045 · Note
• https://suse.com/security/cve/CVE-2025-68383 · Note
• https://suse.com/security/cve/CVE-2026-22771 · Note
• https://suse.com/security/cve/CVE-2026-23511 · Note
• https://suse.com/security/cve/CVE-2026-22689 · Note
• https://t.me/cveNotify/152373 · Telegram Post