Exec Denylist Bypass in OpenClaw MCP Session-Spawn

Publication date: 2026-06-12

Last updated on: 2026-06-16

Assigner: VulnCheck

Description

OpenClaw before 2026.5.12 contains an exec denylist bypass vulnerability in the bundle MCP loopback session-spawn path that allows authenticated callers to bypass intended command restrictions. Attackers can reach the affected bundled MCP session-spawn path to start sessions with broader command reach than intended.

CVSS Scores

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Meta Information

Published

2026-06-12

Last Modified

2026-06-16

Generated

2026-07-03

AI Q&A

2026-06-13

EPSS Evaluated

2026-07-02

NVD

CVE-2026-53820

EUVD

EUVD-2026-36608

Affected Vendors & Products

Vendor	Product	Version / Range
openclaw	openclaw	to 2026.5.12 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability exists in OpenClaw versions before 2026.5.12 and involves an exec denylist bypass in the bundle MCP loopback session-spawn path. Authenticated users can exploit this flaw to bypass intended command restrictions, allowing them to start sessions with broader command execution capabilities than originally intended.

Impact Analysis

The vulnerability allows attackers with some level of authentication to execute commands beyond the intended restrictions. This can lead to unauthorized actions within the system, potentially compromising system integrity, confidentiality, or availability depending on the commands executed.

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