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MEDIUM

GHSA-f7gr-6p89-r883

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

Quick fix

GHSA-f7gr-6p89-r883 — svelte: upgrade to the fixed version with the command below.

npm install svelte@5.51.5

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

npm/svelte
Introduced in: 0Fixed in: 5.51.5
Fixnpm install svelte@5.51.5

References