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Security Advisories

CVE-2026-27121

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-27121

Severity

Unknown
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Summary

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

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.

  • https://nvd.nist.gov/vuln/detail/CVE-2026-27121
  • https://github.com/advisories/GHSA-f7gr-6p89-r883
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27121.json
  • https://github.com/sveltejs/svelte/security/advisories/GHSA-f7gr-6p89-r883

Affected packages

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