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.
References
| Link | Resource |
|---|---|
| https://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19d | Patch |
| https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr | Exploit Vendor Advisory |
| https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr | Exploit Vendor Advisory |
Configurations
History
02 Feb 2026, 19:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19d - Patch | |
| References | () https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr - Exploit, Vendor Advisory | |
| CPE | cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:* | |
| First Time |
Axllent mailpit
Axllent |
08 Jan 2026, 20:15
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr - |
08 Jan 2026, 00:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-01-08 00:16
Updated : 2026-02-02 19:16
NVD link : CVE-2026-21859
Mitre link : CVE-2026-21859
CVE.ORG link : CVE-2026-21859
JSON object : View
Products Affected
axllent
- mailpit
CWE
CWE-918
Server-Side Request Forgery (SSRF)