svelte vulnerable to Cross-site Scripting

Description

An XSS vulnerability exists in Svelte 5.46.0-2 resulting from improper escaping of hydratable keys. If these keys incorporate untrusted user input, arbitrary JavaScript can be injected into server-rendered HTML.

Recommendation

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

• Affected version(s): >= 5.46.0, <= 5.46.3
• Patched version(s): 5.46.4

References

• GHSA-6738-r8g5-qwp3
• fluidattacks.com
• CVE-2025-15265
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Nuxt DevTools vulnerable to cross-site scripting (XSS) - CVE-2025-52662
• @tiptap/extension-link vulnerable to Cross-site Scripting (XSS) - CVE-2025-14284
• Vega vulnerable to Cross-site Scripting via RegExp.prototype[@@replace] (GHSA-963h-3v39-3pqf) - CVE-2025-27793
• jsondiffpatch is vulnerable to Cross-site Scripting (XSS) via HtmlFormatter::nodeBegin - CVE-2025-9910

Tags:

npm

svelte