CVE-2026-46339

9Router is an AI router & token saver. From 0.4.30 until 0.4.37, 9Router's src/proxy.js middleware did not protect /api/cli-tools/* and /api/mcp/*, allowing unauthenticated registration of customPlugins through src/app/api/cli-tools/cowork-settings/route.js and command execution through the MCP bridge. This vulnerability is fixed in 0.4.37.

CVSS v3.1

10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1

10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

3.35% chance of exploitation in the next 30 days, 88th percentile

Nuclei

critical · CWE-78

Published

2026-07-15

Updated

2026-07-16

Proof-of-concept exploits (2)

• advisories/GHSA-fhh6-4qxv-rpqj
• SimoesCTT/CTT-Enhanced-CVE-2026-46339-Exploit-Engine0★ · 2026-08-28

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-46339.yaml

References

• CVE Record
• NVD entry

Related

• CVE-2014-0160
• CVE-2021-26855
• CVE-2022-0847
• CVE-2022-21820
• CVE-2022-22965
• CVE-2023-6246