CVE-2025-15265

Fixed upstream EPSS <1%CVSS 5.3

An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a <script> block without HTML‑safe escaping, allowing </script> to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise. This issue affects Svelte: from 5.46.0 before 5.46.3.

Published 2026-01-15 · CVE record · OSV

Products: svelte

Fixed upstream