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Vulnerabilities

Vulnerability · CVE-2026-114061

SvelteKit : XSS via untrusted cache-control header in prerendered page

Published Oct 21, 2026 · catalog updated Oct 21, 2026 · SvelteKit : XSS via

Last checked Oct 31, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-114061. EPSS is 0.21%. Act only if a listed version of SvelteKit : XSS via is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (SvelteKit : XSS via).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low2.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Advisory link
Affected products
npm @sveltejs · vendor sveltejs kit

Applications that prerender pages and use setHeaders to set a cache-control header from an untrusted source are vulnerable to cross-site scripting (XSS). SvelteKit inserts the header value into a tag without escaping it. An attacker who can influence this value at prerender time can break out of the content attribute and inject HTML or JavaScript into the generated page. The injected code can then execute when users visit …

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm @sveltejsversion unspecified
  • vendor sveltejs kitversion unspecified

How to fix CVE-2026-114061

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-114061. EPSS is 0.21%. Act only if a listed version of SvelteKit : XSS via is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 23, 2026 · GitLab Advisory Database

    Detected

    Applications that prerender pages and use setHeaders to set a cache-control header from an untrusted source are vulnerable to cross-site scripting (XSS). SvelteKit inserts the header value into a tag without escaping it. An attacker who can influence this value at prerender time can break out of the content attribute and inject HTML or JavaScript into the generated page. The injected code can then

Sources

  • CVE.orgVulnerability recordCVE-2026-114061

    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 tag. An attacker who can influence that untrusted value at prerender time can brea

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-114061

    30-day exploitation probability 0.21%

    first.org
  • GitLab Advisory DatabasePackage advisoryCVE-2026-114061

    Applications that prerender pages and use setHeaders to set a cache-control header from an untrusted source are vulnerable to cross-site scripting (XSS). SvelteKit inserts the header value into a tag without escaping it. An attacker who can influence this value at prerender time can break out of the content attribute and inject HTML or JavaScript into the generated page. The injected code can then

    advisories.gitlab.com

References

Freshness

Last verified in this catalog Oct 31, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 31, 2026
  • GitLab Advisory DatabaseOct 27, 2026
  • CVE.orgOct 25, 2026