PT-2026-3743 · Go · Github.Com/Axllent/Mailpit

Published 2026-01-06 · Updated 2026-01-06

OSV

CVSS v3.1

5.8

Medium

Base vector

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

Summary

A Server-Side Request Forgery (SSRF) vulnerability exists in Mailpit's /proxy endpoint that allows attackers to make requests to internal network resources.

Description

The /proxy endpoint allows requests to internal network resources. While it validates http:// and https:// schemes, it does not block internal IP addresses, allowing attackers to access internal services and APIs.

Proof of Concept

Basic SSRF Request

GET /proxy?url=http://127.0.0.1:8025/api/v1/info

This returns internal API data including database path and runtime statistics.

Impact Assessment

1. Internal Network Scanning

Attacker can probe and discover internal services on the network.

2. Information Disclosure

Access to internal API data, database paths, and runtime statistics.

3. Email Content Access

Ability to read all captured emails via internal API endpoints.

4. Cloud Metadata Access

If deployed in cloud environments (AWS/GCP/Azure), potential access to instance metadata services (e.g., http://169.254.169.254/).

Attack Scenarios

Scenario 1: Development Environment Exposure

If Mailpit is accidentally exposed to the internet, attackers can leverage SSRF to access internal development resources and services.

Scenario 2: Container Escape Information

In containerized deployments, SSRF can reveal container metadata and internal service configurations.

Scenario 3: Lateral Movement

In corporate networks, SSRF can be used to discover and interact with internal services, facilitating lateral movement.

Mitigating Factors

This vulnerability is limited to HTTP GET requests with minimal headers. Additionally, Mailpit's web UI & API should be protected by basic authentication when exposed to the internet, which prevents access to the proxy endpoint.

References

• MDN Web Security - SSRF Attacks
• CWE-918: Server-Side Request Forgery
• [OWASP SSRF Prevention Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Server Side Request Forgery Prevention Cheat Sheet.html)

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

GHSA-8V65-47JX-7MFR

Affected Products

Github.Com/Axllent/Mailpit

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-21859 · Security Note
• https://osv.dev/vulnerability/GHSA-8v65-47jx-7mfr · Vendor Advisory
• https://github.com/axllent/mailpit · Note
• https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr · Note
• https://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19d · Note
• https://pkg.go.dev/vuln/GO-2026-4284 · Note