CVE-2026-103758CWE-863broken-access-control

CVE-2026-103758

High · published October 1, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
12.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
8.6 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00221 · 12.0th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-10-01T15:17Z
References (2)
https://github.com/obot-platform/obot/security/advisories/GHSA-6fwv-3h4c-37j9 · [email protected]https://www.vulncheck.com/advisories/obot-0.21.1-through-0.24.1-authorization-bypass-via-mcp-connect-composite-route · [email protected]
EPSS history
Timeline
  • 03 OCT 03:41Z
    EPSS moved — → 0%
    epss
  • 01 OCT 10:42Z
    Obot 0.21.1 through 0.24.1 Authorization Bypass via /mcp-connect-composite/ Route
    cvelistv5