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I. Basic Information for CVE-2026-23845
Vulnerability Information

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Vulnerability Title
Mailpit Vulnerable to Server-Side Request Forgery (SSRF) via HTML Check API
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel="stylesheet" href="...">` tags to inline them for testing. Version 1.28.3 fixes the issue.
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 代码问题漏洞
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 1.28.3之前版本存在代码问题漏洞,该漏洞源于HTML Check功能中的inlineRemoteCSS函数可下载外部CSS文件,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 < 1.28.3 -
II. Public POCs for CVE-2026-23845
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III. Intelligence Information for CVE-2026-23845
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IV. Related Vulnerabilities
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