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

• svelte is vulnerable to XSS with textarea bind:value - Vulnerability
• Angular vulnerable to Cross-site Scripting - CVE-2020-7676
• angular Prototype Pollution vulnerability - CVE-2019-10768
• rollbar vulnerable to prototype pollution - CVE-2025-57325

Tags:

npm

svelte