CVE-2026-43575Network attack vector

Interactive session takeover via unauthenticated noVNC route

Published May 6, 2026 · Updated May 6, 2026

Authentication bypass in OpenClaw 2026.2.21 through 2026.4.9 allows remote attackers to access interactive browser sessions. The browser bridge registers GET /sandbox/novnc without requiring verified bridge authentication, so the handler redeems a valid noVNC token for an unauthenticated request. Exploitation requires a reachable bridge endpoint and a valid noVNC token, which affected builds exposed in model-visible sandbox context.

CVSS severity9.2
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in OpenClaw 2026.2.21 through 2026.4.9 allows remote attackers to access interactive browser sessions. The browser bridge registers GET /sandbox/novnc without requiring verified bridge authentication, so the handler redeems a valid noVNC token for an unauthenticated request. Exploitation requires a reachable bridge endpoint and a valid noVNC token, which affected builds exposed in model-visible sandbox context.

The record

CVE
CVE-2026-43575
Published
May 6, 2026
Updated
May 6, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=2026.2.21 <2026.4.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=2026.2.21 <2026.4.10

Published CVSS scores

9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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