CVE-2026-21859
MEDIUM
GHSA-8v65-47jx-7mfr
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Lifecycle Timeline
4Description
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.
Analysis
Mailpit versions 1.28.0 and earlier contain a server-side request forgery vulnerability in the /proxy endpoint that permits unauthenticated attackers to probe and access internal network resources and services. The endpoint insufficiently validates destination addresses, allowing requests to internal IP ranges despite scheme validation. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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