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CVE-2025-62366— Mailgen vulnerable to HTML injection and cross-site scripting via plaintext email generation

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及之前版本存在跨站脚本漏洞，该漏洞源于generatePlaintext方法未能正确过滤编码HTML实体，可能导致HTML注入攻击。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-62366

Vulnerability Information
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Vulnerability Title
Mailgen vulnerable to HTML injection and cross-site scripting via plaintext email generation
Source: CVE Program / CVE List V5
Vulnerability Description
mailgen is a Node.js package that generates responsive HTML e-mails for sending transactional mail. Mailgen versions through 2.0.30 contain an HTML injection vulnerability in plaintext emails produced by the generatePlaintext method when user‑generated content is supplied. The function attempts to remove HTML tags, but if tags are provided as encoded HTML entities they are not removed and are later decoded, resulting in active HTML (for example an img tag with an event handler) in the supposed plaintext output. In contexts where the generated plaintext string is subsequently rendered as HTML, this can allow execution of attacker‑controlled JavaScript. Versions 2.0.31 and later contain a fix. No known workarounds exist.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P
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及之前版本存在跨站脚本漏洞，该漏洞源于generatePlaintext方法未能正确过滤编码HTML实体，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 < 2.0.31 -

II. Public POCs for CVE-2025-62366

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III. Intelligence Information for CVE-2025-62366

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Vendor Advisories for CVE-2025-62366 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2025-62366

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