High 8.1Published Oct 1, 2026

CVE-2026-103758Obot 0.21.1 through 0.24.1 Authorization Bypass via /mcp-connect-composite/ Route

Updated under an hour ago (Oct 27, 2026, 4:40 AM ET)

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It affects obot-platform obot. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.22%, higher than 12% of scored CVEs.

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Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.22% (percentile 12)
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Oct 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

obot-platform obot obot_platform:obot (from the name)	from 0.21.1 through 0.24.1	CNA record

References

References

https://github.com/obot-platform/obot/security/advisories/GHSA-6fwv-3h4c-37j9	vendor-advisory
https://www.vulncheck.com/advisories/obot-0.21.1-through-0.24.1-authorization-bypass-via-mcp-connect-composite-route	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.