CVE-2026-27121

Fixed in a distro release EPSS <1%CVSS 5.1

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.

Published 2026-02-20 · CVE record · OSV

Products: sveltejs svelte

Fixed upstream

Distro releases