SvelteKit: URL redirection to untrusted site via enhanced form submission

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

2.1 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N · score source

EPSS

• CVE-2026-114060: 0.20% estimated exploitation activity in the next 30 days; percentile 10.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact Applications using enhanced form actions (use:enhance) on routes that accept paths beginning with //, such as catch-all routes, may be vulnerable to an open redirect. Patches A fix has been prepared for @sveltejs/kit 3.0.0. Users should upgrade to 3.0.0 or later. The fix preserves leading double slashes in action paths without generating protocol-relative URLs, restricts non-redirect action navigation to the current origin, and includes the origin when comparing action locations with the current page. Workarounds Reject requests whose parsed URL pathname begins with // before route resolution, for example in a reverse proxy or a SvelteKit handle hook. Alternatively, disable navigation for non-redirect enhanced form results by supplying a custom submission callback: This applies non-redirect results to the current page instead of navigating to the action location.

Published by the source

23 Oct 2026, 20:58 UTC

Last modified by the source

23 Oct 2026, 21:15 UTC

Source last checked

26 Oct 2026, 13:07 UTC

1. Revision 5 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-pfhg-q3qv-9q6r

2. Revision 4 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-pfhg-q3qv-9q6r

3. Revision 3 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

4. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-pfhg-q3qv-9q6r

5. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-pfhg-q3qv-9q6r

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# Patch Next advisory brief: CVE-2026-114060

Advisory: SvelteKit: URL redirection to untrusted site via enhanced form submission
IDs: CVE-2026-114060, GHSA-pfhg-q3qv-9q6r
Record: https://patchnext.com/advisories/cve-2026-114060 (revision 5, source checked 26 Oct 2026, 13:07 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @sveltejs/kit 3.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @sveltejs/kit: affected < 3.0.0; fixed in 3.0.0

## Suggested inspection (read-only)
- `npm ls @sveltejs/kit --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @sveltejs/kit.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-pfhg-q3qv-9q6r (GitHub-reviewed advisory GHSA-pfhg-q3qv-9q6r lists affected ranges: npm @sveltejs/kit >=0 <3.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-pfhg-q3qv-9q6r (OSV record GHSA-pfhg-q3qv-9q6r lists affected ranges: npm @sveltejs/kit >=0 <3.0.0 (fixed))

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