CVE-2025-62366
Mailgen vulnerable to HTML injection and cross-site scripting via plaintext email generation
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.
INFO
Published Date :
Oct. 14, 2025, 4:15 p.m.
Last Modified :
Oct. 8, 2026, 11:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | LOW | [email protected] |
Solution
- Update mailgen to version 2.0.31 or later.
- Review and sanitize all user-generated content.
- Test generated emails for security issues.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-62366.
| URL | Resource |
|---|---|
| https://github.com/eladnava/mailgen/commit/7279a983481d05c51aa451e86146f98aaa42fee9 | |
| https://github.com/eladnava/mailgen/security/advisories/GHSA-xw6r-chmh-vpmj |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-62366 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-62366
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-62366 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-62366 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 08, 2026
Action Type Old Value New Value Added Translation Title: mailgen de eladnava, Description: mailgen es un paquete de Node.js que genera correos electrónicos HTML adaptables para el envío de correo transaccional. Las versiones de Mailgen hasta la 2.0.30 contienen una vulnerabilidad de inyección HTML en los correos electrónicos de texto plano producidos por el método generatePlaintext cuando se proporciona contenido generado por el usuario. La función intenta eliminar etiquetas HTML, pero si las etiquetas se proporcionan como entidades HTML codificadas, no se eliminan y se decodifican posteriormente, lo que resulta en HTML activo (por ejemplo, una etiqueta img con un gestor de eventos) en la supuesta salida de texto plano. En contextos donde la cadena de texto plano generada se renderiza posteriormente como HTML, esto puede permitir la ejecución de JavaScript controlado por el atacante. Las versiones 2.0.31 y posteriores contienen una corrección. No existen soluciones alternativas conocidas. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'eladnava', 'product': 'mailgen', 'versions': [{'status': 'affected', 'version': '< 2.0.31'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-62366', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2025-10-14T16:07:32.176853Z'} -
New CVE Received by [email protected]
Oct. 14, 2025
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-79 Added Reference https://github.com/eladnava/mailgen/commit/7279a983481d05c51aa451e86146f98aaa42fee9 Added Reference https://github.com/eladnava/mailgen/security/advisories/GHSA-xw6r-chmh-vpmj