CVE-2026-103758: Incorrect Authorization in obot-platform obot
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.
AI Analysis
Technical Summary
CVE-2026-103758 describes an authorization bypass vulnerability in obot-platform's obot product affecting versions 0.21.1 through 0.24.1. The vulnerability arises because the checkUI deny list does not include the /mcp-connect-composite/ route, allowing authenticated users with basic roles and a composite MCP ID to proxy requests through mcpGateway.Proxy. This enables them to invoke tools on MCP servers that should be restricted by Access Control Rules, effectively bypassing authorization controls.
Potential Impact
The vulnerability allows authenticated users with limited privileges to bypass access control restrictions and access MCP servers and tools that should be restricted. This can lead to unauthorized actions on MCP servers, potentially compromising system integrity and confidentiality. The CVSS 4.0 score of 8.6 indicates a high severity impact with network attack vector, low attack complexity, no user interaction required, and high impact on confidentiality and integrity.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to authenticated users with composite MCP IDs and monitor for unusual proxy requests to MCP servers via mcpGateway.Proxy.
CVE-2026-103758: Incorrect Authorization in obot-platform obot
Description
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.
CVSS v4.0
Score 8.6high
Affected software
obot-platform
obot
pkg:github/obot-platform/obotRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103758 describes an authorization bypass vulnerability in obot-platform's obot product affecting versions 0.21.1 through 0.24.1. The vulnerability arises because the checkUI deny list does not include the /mcp-connect-composite/ route, allowing authenticated users with basic roles and a composite MCP ID to proxy requests through mcpGateway.Proxy. This enables them to invoke tools on MCP servers that should be restricted by Access Control Rules, effectively bypassing authorization controls.
Potential Impact
The vulnerability allows authenticated users with limited privileges to bypass access control restrictions and access MCP servers and tools that should be restricted. This can lead to unauthorized actions on MCP servers, potentially compromising system integrity and confidentiality. The CVSS 4.0 score of 8.6 indicates a high severity impact with network attack vector, low attack complexity, no user interaction required, and high impact on confidentiality and integrity.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to authenticated users with composite MCP IDs and monitor for unusual proxy requests to MCP servers via mcpGateway.Proxy.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-01T10:39:47.844Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abe7481a43b0b3b89bcf0f1
Added to database: 10/01/2026, 14:56:01 UTC
Last enriched: 10/01/2026, 15:10:41 UTC
Last updated: 10/01/2026, 23:25:59 UTC
Views: 3
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