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CVE-2026-27808— Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API

CVSS 5.8 · Medium EPSS 0.05% · P15
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I. Basic Information for CVE-2026-27808

Vulnerability Information
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Vulnerability Title
Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mailpit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mailpit是Ralph Slooten个人开发者的一个电子邮件测试工具。 Mailpit 1.29.2之前版本存在安全漏洞，该漏洞源于链接检查API对电子邮件中找到的每个URL执行HTTP HEAD请求时未验证目标主机或过滤私有/内部IP地址，可能导致服务端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
axllentmailpit < 1.29.2 -

II. Public POCs for CVE-2026-27808

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III. Intelligence Information for CVE-2026-27808

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IV. Related Vulnerabilities

Same product: mailpit
Same vendor: axllent
Same weakness: CWE-918

V. Comments for CVE-2026-27808

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