Vulnerability · Published Aug 23, 2026 · Assigned by VulnCheck
CVE-2026-74793justhtml before 3.11.0 XSS via selectedcontent projection
Medium 6.1
In plain English
A medium-severity cross-site scripting in justhtml from EmilStenstrom. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 83.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| EmilStenstrom | justhtml | 0 – before 3.11.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- GitHub Security Advisory (GHSA-gjf2-f4jc-69xf) vendor-advisory
- VulnCheck Advisory: justhtml before 3.11.0 XSS via selectedcontent projection third-party-advisory