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TI-2026-78675 Aliases CVE-2026-114062

Server-side request forgery in SvelteKit self-fetch fallbacks

Priority LOW 36CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

SvelteKit before 3.0.0 contains a server-side request forgery flaw (CWE-918) in its self-fetch fallbacks. The fallbacks follow HTTP redirects automatically, so an unauthenticated remote attacker can manipulate the Host or forwarded headers to point fallback requests at their own server. That server redirects the requests to internal services.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

SvelteKit before 3.0.0 contains a server-side request forgery vulnerability that allows remote attackers to reach internal services because self-fetch fallbacks follow HTTP redirects automatically. Attackers can manipulate the Host or forwarded headers to point fallback requests at their server, which redirects them to internal services.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00352 29th percentileScored 2026-11-07
Fix Fixed kit (sveltejs): 3.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sveltejskitbefore 3.0.03.0.0Patch availableCNA
  • kit Vendorsveltejs Affected before 3.0.0 Fixed in 3.0.0 Patch available CNA

Remediation

Upgrade SvelteKit to 3.0.0, which fixes the flaw in all earlier versions.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA kit (sveltejs) Fixed in 3.0.0

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-2026-78674 Cross-site scripting in SvelteKit prerendered pages via cache-control headerPriority LOW 11
    • TI-2026-78673 Open redirect in SvelteKit enhanced form actionsPriority LOW 11
    Show all 4 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-114062
  2. 2026-10-22 Priority changed: MEDIUM → LOW
  3. 2026-10-22 CISA SSVC decision points changed
  4. 2026-11-06 Affected versions changed · Red Hat
  5. 2026-11-06 CVSS score added · Red Hat

References

Advisory 1

  • 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
See all 50 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences