Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`

Description

The contents of bind:innerText and bind:textContent on contenteditable elements were not properly escaped. This could enable HTML injection and Cross-site Scripting (XSS) if rendering untrusted data as the binding’s initial value on the server.

Recommendation

Update the svelte package to the latest compatible version. Followings are version details:

• Affected version(s): <= 5.53.4
• Patched version(s): 5.53.5

References

• GHSA-phwv-c562-gvmh
• CVE-2026-27901
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Svelte affected by XSS in SSR `<option>` element - CVE-2026-27119
• Svelte vulnerable to XSS when using objects during server-side rendering - CVE-2022-25875
• Svelte: XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers - CVE-2026-27902
• billboard.js is vulnerable to XSS during chart option binding - CVE-2026-1513

Tags:

npm

svelte