Is CVE-2026-22689 in the CISA KEV catalog?

No. CVE-2026-22689 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-22689?

CVE-2026-22689 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-22689?

CVE-2026-22689 has an EPSS score of 0.21% (11th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-22689?

Upgrade mailpit to 1.28.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-22689

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-1385

How to fix

Remediation Available

mailpitNVD

Affected:< 1.28.2Fixed in:1.28.2CVE-2026-22689derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.21%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Embed a live status badge for CVE-2026-22689

Markdown

[![CVE-2026-22689](https://tridentstack.com/cve/badge/CVE-2026-22689.svg)](https://tridentstack.com/cve/CVE-2026-22689)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-22689"><img src="https://tridentstack.com/cve/badge/CVE-2026-22689.svg" alt="CVE-2026-22689"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-18.