CVE-2026-21859

nvd nist nuclei

Published: Jan 8, 2026Modified: Jun 17, 2026

5.3

Vector

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

Exploitability: 3.9 / Impact: 1.4

Source: NVD

Description

Mailpit is an email testing tool and API for developers. Versions 1.28.0 and below have a Server-Side Request Forgery (SSRF) vulnerability in the /proxy endpoint, allowing attackers to make requests to internal network resources. The /proxy endpoint validates http:// and https:// schemes, but it does not block internal IP addresses, enabling attackers to access internal services and APIs. This vulnerability is limited to HTTP GET requests with minimal headers. The issue is fixed in version 1.28.1.

Affected (1)

Products: Axllent: Mailpit

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Axllent Mailpit	Before 1.28.1

Related CWEs

Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

References (3)

https://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19d

Source: security-advisories@github.com

Patch

https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr

Source: security-advisories@github.com

ExploitVendor Advisory

https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

ExploitVendor Advisory

Timeline

No history available yet.