CVE-2026-53818

Restricted tool execution via MCP loopback policy bypass

Published Jun 11, 2026 · Updated Jun 11, 2026

Authorization bypass in OpenClaw before 2026.4.24 allows local users to execute restricted tools through the MCP loopback path. The loopback handler omits owner-only tool policy enforcement and before-tool-call hooks for non-owner callers. Exploitation requires low-privileged local access plus an enabled and reachable MCP loopback feature; resulting tool actions depend on operator configuration.

CVSS severity6.9
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in OpenClaw before 2026.4.24 allows local users to execute restricted tools through the MCP loopback path. The loopback handler omits owner-only tool policy enforcement and before-tool-call hooks for non-owner callers. Exploitation requires low-privileged local access plus an enabled and reachable MCP loopback feature; resulting tool actions depend on operator configuration.

The record

CVE
CVE-2026-53818
Published
Jun 11, 2026
Updated
Jun 11, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-862, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 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 <2026.4.24

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.4.24

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

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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