What is CVE-2026-74793?

CVE-2026-74793 is a medium-severity vulnerability in Emilstenstrom Justhtml, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-23.

How severe is CVE-2026-74793?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Emilstenstrom Justhtml

CVE-2026-74793

justhtml before 3.11.0 contains a cross-site scripting vulnerability where the default sanitizer bypasses event handler removal in selectedcontent projections. Attackers can inject SVG or MathML elements with event handlers that are cloned and reinserted into output without sanitization, enabling stored or reflected XSS attacks.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Emilstenstrom Justhtml

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-74793?: CVE-2026-74793 is a medium-severity vulnerability in Emilstenstrom Justhtml, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-23.
How severe is CVE-2026-74793?: Medium severity. CVSS v3 base score is 6.1 out of 10.