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CVE-2025-62380— Mailgen has HTML Injection and XSS Filter Bypass in Plaintext Emails

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 2.0.31及之前版本存在跨站脚本漏洞，该漏洞源于generatePlaintext方法在处理用户生成内容时未正确过滤HTML标签，可能导致跨站脚本攻击。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2025-62380

Vulnerability Information
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Vulnerability Title
Mailgen has HTML Injection and XSS Filter Bypass in Plaintext Emails
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 2.0.31 contain an HTML injection vulnerability in plaintext emails generated with the generatePlaintext method when user generated content is supplied. The plaintext generation code attempts to strip HTML tags using a regular expression and then decodes HTML entities, but tags that include certain Unicode line separator characters are not matched and removed. These encoded tags are later decoded into valid HTML content, allowing unexpected HTML to remain in output intended to be plaintext. Projects are affected if they call Mailgen.generatePlaintext with untrusted input and then render or otherwise process the returned string in a context where HTML is interpreted. This can lead to execution of attacker supplied script in the victim’s browser. Version 2.0.32 fixes the issue.
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 2.0.31及之前版本存在跨站脚本漏洞，该漏洞源于generatePlaintext方法在处理用户生成内容时未正确过滤HTML标签，可能导致跨站脚本攻击。
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 < 2.0.32 -

II. Public POCs for CVE-2025-62380

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III. Intelligence Information for CVE-2025-62380

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IV. Related Vulnerabilities

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

V. Comments for CVE-2025-62380

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