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CVE-2025-59526— Mailgen: HTML injection vulnerability in plaintext e-mails

Quick assessment

Affected
eladnava mailgen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mailgen是Elad Nava个人开发者的一个邮件生成库。 mailgen 2.0.30之前版本存在跨站脚本漏洞，该漏洞源于未对用户生成内容进行适当处理，可能导致HTML注入攻击。

AI Predicted 5.6 Difficulty: Easy EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2025-59526

Vulnerability Information
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Vulnerability Title
Mailgen: HTML injection vulnerability in plaintext e-mails
Source: CVE Program / CVE List V5
Vulnerability Description
mailgen is a Node.js package that generates responsive HTML e-mails for sending transactional mail. Prior to version 2.0.30, there is an HTML injection vulnerability in plaintext e-mails generated by Mailgen. Projects are affected if the Mailgen.generatePlaintext(email) method is used and given user-generated content. This vulnerability has been patched in version 2.0.30. A workaround involves stripping all HTML tags before passing any content into Mailgen.generatePlaintext(email).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:L/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
mailgen 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mailgen是Elad Nava个人开发者的一个邮件生成库。 mailgen 2.0.30之前版本存在跨站脚本漏洞，该漏洞源于未对用户生成内容进行适当处理，可能导致HTML注入攻击。
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

Vendor Product Affected Versions CPE Subscribe
eladnava mailgen < 2.0.30 -

II. Public POCs for CVE-2025-59526

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III. Intelligence Information for CVE-2025-59526

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IV. Related Vulnerabilities

Same product: mailgen
Same vendor: eladnava
Same weakness: CWE-79

V. Comments for CVE-2025-59526

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