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GHSA-f7gr-6p89-r883

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

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-27121

Packages

EcosystemPackageAffectedFixed in
npm svelte < 5.51.5 5.51.5

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.