CVE-2025-62366
CVE-2025-62366 is a low-severity vulnerability with a CVSS 4.0 base score of 2.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Low (CVSS 4.0 base score 2.9)
- EPSS exploit prediction: 0% (31st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-34231
- Weakness: CWE-79
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2025-62366?
- 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.
- How severe is CVE-2025-62366?
- CVE-2025-62366 has a CVSS 4.0 base score of 2.9, rated low severity.
- Is CVE-2025-62366 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-62366?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-62366 have an EU (EUVD) identifier?
- Yes. CVE-2025-62366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34231.
- When was CVE-2025-62366 published?
- CVE-2025-62366 was published on 2025-10-14 and last updated on 2026-06-17.
References
- https://github.com/eladnava/mailgen/commit/7279a983481d05c51aa451e86146f98aaa42fee9
- https://github.com/eladnava/mailgen/security/advisories/GHSA-xw6r-chmh-vpmj
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