CVE-2026-103758

Obot 0.21.1 through 0.24.1 contains an authorization bypass vulnerability that allows authenticated users to reach MCP servers because the checkUI deny list omits the /mcp-connect-composite/ route. Basic-role users with a composite MCP ID can proxy requests through mcpGateway.Proxy to invoke tools on MCP servers restricted by Access Control Rules.

  • Published Oct 1, 2026
  • CVSS 8.6 high
  • 0.2% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-103758 at the National Vulnerability Database