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5.1 Medium

CVE-2026-27121 svelte performance oriented web framework

Description

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.

Affected products and versions

Product Affected versions Fixed in
svelte 5.51 earliest → < 5.51.5 5.51.5

References

Timeline

  1. Published
  2. Last modified

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