CVE-2026-101084

obot before v0.21.1 Authorization Bypass via /mcp-connect

At a glance

Severity: CRITICAL 9.3
EPSS: EPSS 0.35 % · percentile 28 (2026-10-27)
State: PUBLISHED
Published: 2026-09-27
Updated: 2026-09-30
Assigner: VulnCheck
NVD status: Deferred

Description

obot versions before v0.21.1 fail to enforce Access Control Rules on the /mcp-connect endpoint, allowing any authenticated user to connect to restricted MCP servers if they possess the server ID. Attackers can bypass authorization checks to access and manipulate sensitive backend systems through MCP tool calls using stored OAuth credentials.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	CRITICAL 9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N	VulnCheck
CVSS 3.1	CRITICAL 9.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N	VulnCheck
CVSS 4.0	CRITICAL 9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · disclosure@vulncheck.com (Secondary)
CVSS 3.1	CRITICAL 9.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N	NVD · disclosure@vulncheck.com (Secondary)

Weaknesses (CWE)

CWE-639

Advisories

GHSA-vw82-7fv8-r6gp — Obot has an authorization bypass in /mcp-connect/{id} that allows any authenticated user to use any registered MCP server
GO-2026-5678 — Obot has an authorization bypass in /mcp-connect/{id} that allows any authenticated user to use any registered MCP server in github.com/obot-platform/obot

European references

ENISA EUVD · EUVD-2026-88029
GCVE · GCVE-0-2026-101084

Affected products

Product	Versions
obot-platform · obot	affected 0 < 0.21.1 ; unaffected 0.21.1

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD