CVE-2026-103758 Obot 0.21.1 through 0.24.1 Authorization Bypass via /mcp-connect-composite/ Route
Authenticated basic-role users can bypass authorization checks to invoke restricted tools on MCP servers via the composite route.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103758?
CVE-2026-103758 is a high-severity missing authorization vulnerability in obot-platform obot, published on 1 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-103758?
How do I fix CVE-2026-103758?
No fix has been published for CVE-2026-103758 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-103758 being exploited?
There is no known exploitation of CVE-2026-103758 in the wild and no public exploit code.
Sources
Also known as GHSA-6fwv-3h4c-37j9, GHSA-x6jv-4hp7-3vj9.