CVE-2026-53820

Command restriction bypass via omitted MCP denylist

Published Jun 12, 2026 · Updated Jun 12, 2026

Access-control bypass in OpenClaw before 2026.5.12 allows local users to exceed command restrictions via bundled MCP session spawn. The bundled MCP loopback session-spawn path omits the exec denylist intended for that entry point, creating sessions with broader command reach. Exploitation requires the feature to be enabled and reachable by lower-trust input; consequences remain bounded by policy, approvals, allowlists, and sandboxing.

CVSS severity6.9
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access-control bypass in OpenClaw before 2026.5.12 allows local users to exceed command restrictions via bundled MCP session spawn. The bundled MCP loopback session-spawn path omits the exec denylist intended for that entry point, creating sessions with broader command reach. Exploitation requires the feature to be enabled and reachable by lower-trust input; consequences remain bounded by policy, approvals, allowlists, and sandboxing.

The record

CVE
CVE-2026-53820
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-284, CWE-862, CWE-78, T1059
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.5.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.5.12

Published CVSS scores

6.9VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
6.6VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-862Missing Authorization
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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