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CVE-2026-74793— justhtml before 3.11.0 XSS via selectedcontent projection

Quick assessment

Affected
EmilStenstrom justhtml
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

justhtml 3.11.0 之前的版本存在跨站脚本（XSS）漏洞。该漏洞源于默认消毒剂在 selectedContent 投影中未能正确移除事件处理程序。攻击者可注入带有事件处理程序的 SVG 或 MathML 元素，这些元素在未被消毒剂处理的情况下被克隆并重新插入输出内容中，从而可能导致存储型或反射型跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.20% · P10

Affected Version Matrix 2

VendorProduct Version RangeStatus
EmilStenstrom justhtml < 3.11.0 affected
3.11.0 unaffected
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I. Basic Information for CVE-2026-74793

Vulnerability Information
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Vulnerability Title
justhtml before 3.11.0 XSS via selectedcontent projection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
EmilStenstrom justhtml 0 ~ 3.11.0 -

II. Public POCs for CVE-2026-74793

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III. Intelligence Information for CVE-2026-74793

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Vendor Advisories for CVE-2026-74793 (1)

Proof of Concept for CVE-2026-74793 (1)

Same Patch Batch · EmilStenstrom · 2026-08-23 · 11 CVEs total

CVE-2026-7808 9.8 CRITICAL justhtml before 1.16.0 Multiple Security Issues via Sanitization
CVE-2026-8445 9.8 CRITICAL justhtml before 1.12.0 Sanitizer Bypass via Markdown
CVE-2026-5388 9.8 CRITICAL justhtml before 1.15.0 Multiple Security Issues
CVE-2026-9769 7.5 HIGH justhtml before 1.10.0 Denial of Service via deeply nested HTML
CVE-2026-4671 7.5 HIGH justhtml before 1.18.0 Denial of Service via CSS Selector
CVE-2026-77088 6.1 MEDIUM justhtml 0.9.0 through 1.21.0 Cross-Site Scripting via code-span
CVE-2026-6827 6.1 MEDIUM justhtml before 1.17.0 Multiple Cross-Site Scripting Vulnerabilities
CVE-2026-8630 6.1 MEDIUM justhtml before 1.12.0 Mutation XSS via Raw Text Elements
CVE-2026-5751 6.1 MEDIUM justhtml before 1.14.0 Mutation XSS via custom sanitization policies
CVE-2026-5389 6.1 MEDIUM justhtml before 1.13.0 XSS via code fence breakout

IV. Related Vulnerabilities

Same product: justhtml
Same vendor: EmilStenstrom
Same weakness: CWE-79

V. Comments for CVE-2026-74793

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