CVE-2026-27121

Updated on 20 Feb 2026

Severity

5.1 Medium severity

Details

CVSS score
5.1
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Overview

About vulnerability

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.

Details

Affected packages:
svelte (+13 more)

Fixes