CVE-2026-114060: SvelteKit before 3.0.0 Open Redirect via Enhanced Form Actions

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-21 · updated 2026-10-22
Weakness: CWE-601

Description

SvelteKit (@sveltejs/kit) before 3.0.0 contains an open redirect vulnerability in enhanced form actions (use:enhance) on routes accepting paths beginning with a double slash. Attackers can craft action paths starting with // that become protocol-relative URLs, causing non-redirect form results to navigate victims to attacker-controlled sites.

Affected products

sveltejs kit: before 3.0.0 — fixed in 3.0.0

How to fix

Upgrade to a fixed version: sveltejs kit 3.0.0. Check the vendor advisory for mitigations.

References

https://github.com/sveltejs/kit/security/advisories/GHSA-pfhg-q3qv-9q6r
https://www.vulncheck.com/advisories/sveltekit-before-3.0.0-open-redirect-via-enhanced-form-actions

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