What is CVE-2026-57531?

CVE-2026-57531 is a medium-severity vulnerability in Milkdown, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-07-24.

How severe is CVE-2026-57531?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Milkdown

CVE-2026-57531

Milkdown before 7.21.3 contains a DOM cross-site scripting vulnerability in the @milkdown/plugin-emoji package that allows unauthenticated attackers to execute arbitrary JavaScript in the host application's origin by causing a victim to pa…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Milkdown — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (release-notes, patch)
disclosure@vulncheck.com (issue-tracking, patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-57531?: CVE-2026-57531 is a medium-severity vulnerability in Milkdown, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-07-24.
How severe is CVE-2026-57531?: Medium severity. CVSS v3 base score is 5.4 out of 10.