CVE-2026-27808

published 2026-02-26

CVE-2026-27808: Mailpit is an email testing tool and API for developers. Prior to version 1.29.2, the Link Check API (/api/v1/message/{ID}/link-check) is vulnerable to…

Priority P3 53 high 8.6 CVSS 3.1

AV N AC L PR N UI N S C C H I N A N

Mailpit is an email testing tool and API for developers. Prior to version 1.29.2, the Link Check API (/api/v1/message/{ID}/link-check) is vulnerable to Server-Side Request Forgery (SSRF). The server performs HTTP HEAD requests to every URL found in an email without validating target hosts or filtering private/internal IP addresses. The response returns status codes and status text per link, making this a non-blind SSRF. In the default configuration (no authentication on SMTP or API), this is fully exploitable remotely with zero user interaction. This is the same class of vulnerability that was fixed in the HTML Check API (CVE-2026-23845 / GHSA-6jxm-fv7w-rw5j) and the screenshot proxy (CVE-2026-21859 / GHSA-8v65-47jx-7mfr), but the Link Check code path was not included in either fix. Version 1.29.2 fixes this vulnerability.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
axllent	mailpit	< 1.29.2	1.29.2
github.com	axllent_mailpit	>= 0 < 1.29.2	1.29.2
github.com	axllent_mailpit	>= 0 < 1.30.2	1.30.2

CVSS provenance

nvd v3.1 8.6 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

ghsa 8.6 HIGH

osv 5.3 MEDIUM

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CWE-918