How severe is CVE-2025-59526?

CVE-2025-59526 has a CVSS 4.0 base score of 2.7, rated low severity.

Is CVE-2025-59526 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-59526?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-59526 have an EU (EUVD) identifier?

Yes. CVE-2025-59526 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-30449.

When was CVE-2025-59526 published?

CVE-2025-59526 was published on 2025-09-22 and last updated on 2026-06-17.

CVE-2025-59526

CVE-2025-59526 is a low-severity vulnerability with a CVSS 4.0 base score of 2.7. 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 2.7)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-30449
Weakness: CWE-79
Published: 2025-09-22
Last modified: 2026-06-17

Description

mailgen is a Node.js package that generates responsive HTML e-mails for sending transactional mail. Prior to version 2.0.30, there is an HTML injection vulnerability in plaintext e-mails generated by Mailgen. Projects are affected if the Mailgen.generatePlaintext(email) method is used and given user-generated content. This vulnerability has been patched in version 2.0.30. A workaround involves stripping all HTML tags before passing any content into Mailgen.generatePlaintext(email).

Frequently asked questions

What is CVE-2025-59526?: mailgen is a Node.js package that generates responsive HTML e-mails for sending transactional mail. Prior to version 2.0.30, there is an HTML injection vulnerability in plaintext e-mails generated by Mailgen. Projects are affected if the Mailgen.generatePlaintext(email) method is used and given user-generated content. This vulnerability has been patched in version 2.0.30. A workaround involves stripping all HTML tags before passing any content into Mailgen.generatePlaintext(email).
How severe is CVE-2025-59526?: CVE-2025-59526 has a CVSS 4.0 base score of 2.7, rated low severity.
Is CVE-2025-59526 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-59526?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-59526 have an EU (EUVD) identifier?: Yes. CVE-2025-59526 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-30449.
When was CVE-2025-59526 published?: CVE-2025-59526 was published on 2025-09-22 and last updated on 2026-06-17.

References

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