---
id: CVE-2026-114061
title: SvelteKit before 3.0.0 XSS via Cache-Control Header in Prerendered Pages
summary: >-
  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. …
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: sveltejs
product: kit
affected:
  - kit < 3.0.0
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T00:36:35.456Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114061'
references:
  - url: 'https://github.com/sveltejs/kit/security/advisories/GHSA-27mw-82g8-phjj'
    label: GitHub Security Advisory (GHSA-27mw-82g8-phjj)
  - url: >-
      https://www.vulncheck.com/advisories/sveltekit-before-3.0.0-xss-via-cache-control-header-in-prerendered-pages
    label: >-
      VulnCheck Advisory: SvelteKit before 3.0.0 XSS via Cache-Control Header in
      Prerendered Pages
tags:
  - cve.org
ingestedAt: '2026-10-21T01:37:08.039Z'
---

## Overview

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.

## Affected

- `kit < 3.0.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.