Solid Lacks Escaping of HTML in JSX Fragments allows for Cross-Site Scripting (XSS)

Description

Inserts/JSX expressions inside illegal inlined JSX fragments lacked escaping, allowing user input to be rendered as HTML when put directly inside JSX fragments.

For instance, ?text=<svg/onload=alert(1)> would trigger XSS here.

Recommendation

Update the solid-js package to the latest compatible version. Followings are version details:

• Affected version(s): < 1.9.4
• Patched version(s): 1.9.4

References

• GHSA-3qxh-p7jc-5xh6
• CVE-2025-27109
• CWE-116
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• DOMPurify allows Cross-site Scripting (XSS) - CVE-2025-26791
• Vega allows Cross-site Scripting via the vlSelectionTuples function (GHSA-mp7w-mhcv-673j) - CVE-2025-25304
• Trix allows Cross-site Scripting via `javascript:` url in a link - CVE-2025-21610
• Vega allows Cross-site Scripting via the vlSelectionTuples function - CVE-2025-25304

Tags:

npm

solid-js