Open redirect in SvelteKit enhanced form actions
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-601.
Summary
SvelteKit (@sveltejs/kit) before 3.0.0 contains an open redirect flaw (CWE-601) in enhanced form actions used with use:enhance. Routes that accept action paths beginning with a double slash let an attacker craft paths that become protocol-relative URLs. A remote attacker needs no privileges, but when a form returns a non-redirect result, the victim's browser navigates to an attacker-controlled site.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| sveltejs | kit | before 3.0.0 | 3.0.0 | Patch available | CNA |
| — | @sveltejs/kit (npm) | before 3.0.0 | 3.0.0 | Patch available | GHSA-pfhg-q3qv-9q6r |
- kit Vendorsveltejs Affected before 3.0.0 Fixed in 3.0.0 Patch available CNA
- @sveltejs/kit (npm) Vendor— Affected before 3.0.0 Fixed in 3.0.0 Patch available GHSA-pfhg-q3qv-9q6r
Remediation
Upgrade SvelteKit (sveltejs/kit, npm package @sveltejs/kit) to 3.0.0, the fixed version.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
- Fix · CNA kit (sveltejs) Fixed in 3.0.0
- Fix · GHSA-pfhg-q3qv-9q6r @sveltejs/kit (npm) Fixed in 3.0.0 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
sveltejs kit 3.0.0
4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-78676 Path traversal in SvelteKit vite preview on Windows exposes filesPriority MEDIUM 44
- TI-2026-78675 Server-side request forgery in SvelteKit self-fetch fallbacksPriority LOW 36
- TI-2026-78674 Cross-site scripting in SvelteKit prerendered pages via cache-control headerPriority LOW 11
Timeline
- 2026-10-21 Threatist record created from CVE-2026-114060
- 2026-10-21 CISA SSVC decision points changed
- 2026-10-23 Alias added: GHSA-pfhg-q3qv-9q6r
- 2026-10-23 Fix available: npm/@sveltejs/[email protected] · GHSA-pfhg-q3qv-9q6r
- 2026-10-23 CVSS score added · GHSA-pfhg-q3qv-9q6r
- 2026-10-23 Weakness changed · GHSA-pfhg-q3qv-9q6r
- 2026-10-23 5 new references · GHSA-pfhg-q3qv-9q6r
References
More sveltejs vulnerabilities
- TI-2023-13469 SvelteKit framework has Insufficient CSRF protection for CORS requests CVSS 3.1HIGH 8.8
- TI-2023-13464 SvelteKit has Insufficient Cross-Site Request Forgery Protection CVSS 3.1HIGH 8.8
- TI-2024-15660 Sending a GET or HEAD request with a body crashes SvelteKit CVSS 3.1HIGH 7.5
- TI-2024-30159 Potential mXSS vulnerability due to improper HTML escaping in svelte CVSS 3.1MEDIUM 6.1
- TI-2025-23466 SvelteKit allows XSS via tracked search_params CVSS 3.1MEDIUM 5.4
- TI-2025-13940 Svelte 5.46.0 - Hydratable Key Script-Breakout XSS (SSR) CVSS 4.0MEDIUM 5.3
Sources
- CVE-2026-114060 · CVE Program
- CVE-2026-114060 · NVD
- FIRST EPSS
- GHSA-pfhg-q3qv-9q6r · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences