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TI-2025-38634 Aliases CVE-2025-62366GHSA-xw6r-chmh-vpmj

Mailgen vulnerable to HTML injection and cross-site scripting via plaintext email generation

Priority MEDIUM 48CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00428 37th percentileScored 2026-11-07
Fix Fixed mailgen (eladnava): 2.0.31mailgen (npm): 2.0.31

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
eladnavamailgenbefore 2.0.312.0.31Patch availableCNA
—mailgen (npm)before 2.0.312.0.31Patch availableGHSA-xw6r-chmh-vpmj
  • mailgen Vendoreladnava Affected before 2.0.31 Fixed in 2.0.31 Patch available CNA
  • mailgen (npm) Vendor— Affected before 2.0.31 Fixed in 2.0.31 Patch available GHSA-xw6r-chmh-vpmj

Remediation

  • Fix · CNA mailgen (eladnava) Fixed in 2.0.31
  • Fix · GHSA-xw6r-chmh-vpmj mailgen (npm) Fixed in 2.0.31 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-62366
  2. 2026-10-03 Alias added: GHSA-xw6r-chmh-vpmj

References

Advisory 1

Other 3

  • TI-2025-38647 Mailgen has HTML Injection and XSS Filter Bypass in Plaintext Emails CVSS 4.0LOW 2.9
  • TI-2025-37057 Mailgen: HTML injection vulnerability in plaintext e-mails CVSS 4.0LOW 2.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences