Categories
CVE-2026-27121

Svelte affected by cross-site scripting via spread attributes in Svelte SSR

Summary

Svelte affected by cross-site scripting via spread attributes in Svelte SSR

Original description

The description as published by the source.

svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

References

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