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CVE-2026-21859
Good to know:
Date: January 7, 2026
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.
Severity Score
Related Resources (6)
Severity Score
Weakness Type (CWE)
Server-Side Request Forgery (SSRF)
CWE-918Top Fix
Upgrade Version
Upgrade to version github.com/axllent/mailpit - v1.28.1;https://github.com/axllent/mailpit.git - v1.28.1
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | CHANGED |
| Confidentiality (C): | LOW |
| Integrity (I): | NONE |
| Availability (A): | NONE |