Server-side Request Forgery (SSRF) Affecting github.com/axllent/mailpit/server/handlers package, versions <1.28.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMAXLLENTMAILPITSERVERHANDLERS-14894364
- published7 Jan 2026
- disclosed6 Jan 2026
- creditOmar Kurt
Introduced: 6 Jan 2026
CVE-2026-21859 Â (opens in a new tab)How to fix?
Upgrade github.com/axllent/mailpit/server/handlers to version 1.28.1 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the proxy endpoint. An attacker can access internal network resources and sensitive information by sending crafted HTTP GET requests to internal IP addresses through the endpoint.
Note: This is only exploitable if the web UI or API is exposed to the internet without proper authentication.