justhtml before 3.11.0 XSS via selectedcontent projection
Priority MEDIUM 56CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0025 16th percentileScored 2026-11-07
Fix Fixed justhtml (EmilStenstrom): 3.11.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| EmilStenstrom | justhtml | before 3.11.0 | 3.11.0 | Patch available | CNA |
- justhtml VendorEmilStenstrom Affected before 3.11.0 Fixed in 3.11.0 Patch available CNA
Remediation
- Fix · CNA justhtml (EmilStenstrom) Fixed in 3.11.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74793
- 2026-10-03 Alias added: GHSA-h7rw-29pr-mcj6
References
More EmilStenstrom vulnerabilities
- TI-2026-07422 justhtml before 1.12.0 Sanitizer Bypass via Markdown CVSS 4.0CRITICAL 9.3
- TI-2026-08560 justhtml before 1.10.0 Denial of Service via deeply nested HTML CVSS 4.0HIGH 8.7
- TI-2026-04717 justhtml before 1.13.0 XSS via code fence breakout CVSS 4.0MEDIUM 5.1
- TI-2026-06871 justhtml before 1.16.0 Multiple Security Issues via Sanitization CVSS 4.0CRITICAL 9.3
- TI-2026-04716 justhtml before 1.15.0 Multiple Security Issues CVSS 4.0CRITICAL 9.3
- TI-2026-04066 justhtml before 1.18.0 Denial of Service via CSS Selector CVSS 4.0HIGH 8.7
Sources
- CVE-2026-74793 · CVE Program
- CVE-2026-74793 · NVD
- FIRST EPSS
- GHSA-h7rw-29pr-mcj6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences