Which versions of OpenClaw are affected by EUVD-2026-28166?

OpenClaw versions before 2026.4.9 contain an arbitrary file read vulnerability that allows authenticated attackers to bypass security controls and access local files through navigation manipulation,…. A patch is available.

How to fix or mitigate EUVD-2026-28166?

Within 24 hours: Identify all OpenClaw deployments and document current versions in use. Within 7 days: Upgrade all OpenClaw instances to version 2026.4.9 or later (npm 2026.4.14 confirmed patched); verify upgrade completion and test navigation security controls. Within 30 days: Conduct file access audit logs to identify any suspicious local file read patterns and implement network segmentation to restrict OpenClaw's file system access permissions.

OpenClaw EUVD-2026-28166

Q: What is the CVSS score of EUVD-2026-28166?

EUVD-2026-28166 has a CVSS 4.0 base score of 7.1 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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. EPSS exploitation probability: 0.0%.

| CVE-2026-43577 HIGH

Missing Authorization (CWE-862)

2026-05-06 disclosure@vulncheck.com

Authentication Bypass Openclaw

7.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

7.1 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Patch available

May 06, 2026 - 21:03 EUVD

Source Code Evidence Fetched

May 06, 2026 - 20:33 vuln.today

Analysis Generated

May 06, 2026 - 20:33 vuln.today

CVE Published

May 06, 2026 - 20:16 nvd

HIGH 7.1

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1 npm packages depend on openclaw (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 2026.4.9.

DescriptionCVE.org

OpenClaw before 2026.4.9 contains a file read vulnerability allowing attackers to bypass navigation guards through browser act/evaluate interactions. Attackers can pivot into the local CDP origin and create or read disallowed file:// pages despite direct navigation policy restrictions.

AnalysisAI

Arbitrary file read in OpenClaw before 2026.4.9 allows authenticated remote attackers to bypass navigation guards and access local files via browser interaction routes. Attackers exploit the ability to trigger navigation into the local Chrome DevTools Protocol (CDP) origin through act/evaluate commands, then create or read disallowed file:// URLs despite direct navigation policy restrictions. Patch available in version 2026.4.9 and confirmed included in npm release 2026.4.14. No public exploit code identified at time of analysis, CVSS 7.1 (High) with network attack vector and low complexity.

Technical ContextAI

OpenClaw is a browser automation framework utilizing the Chrome DevTools Protocol (CDP) for programmatic control. The vulnerability stems from CWE-862 (Missing Authorization) in the navigation guard implementation. When browser interaction primitives (click, evaluate, batched actions) trigger main-frame navigations, the original implementation failed to re-validate destination URLs against configured SSRF quarantine policies. This allowed attackers to pivot from permitted origins into the local CDP control plane (typically http://127.0.0.1:9222) and subsequently navigate to file:// scheme URLs. The CDP origin provides elevated local access capabilities that should be protected by the navigation policy but were bypassed through the interaction-driven navigation path. The fix implements post-interaction URL validation by registering framenavigated event listeners that invoke assertPageNavigationCompletedSafely after browser interactions complete, ensuring all navigation paths enforce the same security policy.

RemediationAI

Upgrade OpenClaw to version 2026.4.9 or later. The npm package openclaw@2026.4.14 contains the verified fix. Patch delivered via GitHub commit 5f5b3d733bdd791cb457f838514179e1288b10b3 and pull request #63226, which implements post-navigation URL validation in browser interaction routes. Organizations unable to upgrade immediately should implement compensating controls: restrict OpenClaw API access to highly trusted users only, apply network segmentation to prevent CDP endpoint access from OpenClaw processes (block outbound connections to 127.0.0.1:9222 and similar CDP ports), and enable comprehensive audit logging of all browser.click, browser.evaluate, and batch interaction commands to detect potential abuse attempts. Note that blocking CDP access may break legitimate automation workflows that require devtools interaction. Review authentication mechanisms for OpenClaw instances and ensure multi-factor authentication where feasible. Advisory: https://github.com/openclaw/openclaw/security/advisories/GHSA-qmwg-qprg-3j38, Fix PR: https://github.com/openclaw/openclaw/pull/63226.