High severity · published Oct 1, 2026
CVE-2026-103758
Obot 0.21.1 through 0.24.1 Authorization Bypass via /mcp-connect-composite/ Route
8.1
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OB
obot · obot-platform
0.21.1 through 0.24.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103758
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103758
vendor-advisory
https://github.com/obot-platform/obot/security/advisories/GHSA-6fwv-3h4c-37j9
third-party-advisory
https://www.vulncheck.com/advisories/obot-0.21.1-through-0.24.1-authorization-bypass-via-mcp-connect-composite-route
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