CVE-2026-114061

Medium

Description

SvelteKit (@sveltejs/kit) before 3.0.0 contains a cross-site scripting vulnerability in prerendered pages because a cache-control header value set via setHeaders is inserted without escaping into a <meta http-equiv="cache-control"> tag. An attacker who can influence that untrusted value at prerender time can break out of the content attribute and inject HTML or JavaScript that executes when users visit the page.

SeverityMedium

CVSS4.7

Exploit probability—

Product@sveltejs/kit

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

@sveltejs/kit3.0.0 or later

Vendor advisories

github.com/sveltejs/kit/security/advisories/GHSA-27mw-82g8-phjj

Affected products

Product	Affected versions	Fixed in
@sveltejs/kitnpm	v < 3.0.0	3.0.0

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