TI-2026-40862 Aliases CVE-2026-56679 GHSA-vmjq-hvgq-2wv4

9Router: Mass assignment in PATCH /api/settings allows authenticated authorization downgrade

HIGH 73CWE-915Published 2026-07-15 · Updated 2026-07-16

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-915.

Summary

9Router is an AI router & token saver. Prior to 0.5.4, the PATCH /api/settings endpoint writes the entire request body to persistent settings without a field whitelist, allowing an authenticated user to set security-critical fields such as requireLogin and disable authentication for the whole application, exposing protected routes such as /api/keys and /api/providers to unauthenticated access. This issue is reported as fixed in version 0.5.4.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00401 34th percentileScored 2026-11-07

Fix Fixed 9router (decolua): 0.5.49router (npm): 0.5.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

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
decolua	9router	before 0.5.4	0.5.4	Patch available	CNA
—	9router (npm)	before 0.5.4	0.5.4	Patch available	GHSA-vmjq-hvgq-2wv4

9router Vendordecolua Affected before 0.5.4 Fixed in 0.5.4 Patch available CNA
9router (npm) Vendor— Affected before 0.5.4 Fixed in 0.5.4 Patch available GHSA-vmjq-hvgq-2wv4

Remediation

Fix · CNA 9router (decolua) Fixed in 0.5.4
Fix · GHSA-vmjq-hvgq-2wv4 9router (npm) Fixed in 0.5.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-56679
2026-10-03 Alias added: GHSA-vmjq-hvgq-2wv4

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-56679

Other 2

TI-2026-36526 9Router: Hardcoded Default fallback JWT Secret Allows Authentication Bypass CVSS 3.1CRITICAL 9.8
TI-2026-34059 9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes CVSS 3.1CRITICAL 10.0
TI-2026-44499 9Router 0.4.41 - Unauthenticated API Key Exposure via /api/usage/stats CVSS 4.0CRITICAL 9.3
TI-2026-42622 9Router 0.4.41 - Unauthenticated API Exposure via /api/providers CVSS 4.0CRITICAL 9.3
TI-2026-44500 9Router 0.4.41 - Unauthenticated Information Disclosure via API Usage Endpoints CVSS 4.0HIGH 8.7
TI-2026-40860 9Router: Authenticated Server-Side Request Forgery (SSRF) via OIDC Provider Test Endpoint CVSS 3.1HIGH 8.6

See all 25 →

Sources

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