EUVD-2026-21622
GHSA-93g8-mgqc-w7h9
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessSend unauthenticated request to canvas endpoint
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ExploitExploit improper authentication implementation
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ExecutionBypass authentication mechanism
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ImpactAccess protected canvas resources
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication IP-independent authentication
|
| Exploitation Conditions | No special conditions — remote unauthenticated attacker can bypass authentication on OpenClaw canvas endpoints in default configurations. AC:H suggests exploitation requires timing or specific conditions, but no feature-specific prerequisite stated in description. |
| Impact | CVSS 7.4 reflects high confidentiality and integrity impact via unauthenticated network access, though AC:H moderates immediate risk. Canvas endpoint authentication bypass enables credential-free system compromise. No KEV or public exploit identified; organizational exposure depends on OpenClaw deployment scope and network exposure. Prioritize patching internet-facing instances. |
| Exploit ScenarioDerived | Attacker sends crafted request to canvas authentication endpoint (AV:N). Improper implementation fails to validate credentials, bypassing authentication check. Attacker gains unauthenticated access to sensitive functions with high complexity constraints. |
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Alert meAnalysisAIv1 – Apr 11, 2026
Unauthenticated remote attackers bypass authentication in OpenClaw canvas endpoints due to improper authentication implementation (CWE-291). Exploitation requires no user interaction and yields high confidentiality/integrity impact. Network-accessible attack vector with high complexity (CVSS:3.0 7.4 AV:N/AC:H/PR:N). No public exploit identified at time of analysis. Originally reported as ZDI-CAN-29311.
RemediationAI
Apply vendor-released patch per GitHub Security Advisory GHSA-vvjh-f6p9-5vcf at https://github.com/openclaw/openclaw/security/advisories/GHSA-vvjh-f6p9-5vcf. Consult Zero Day Initiative advisory ZDI-26-228 at https://www.zerodayinitiative.com/advisories/ZDI-26-228/ for additional technical details. Released patched version not independently confirmed from provided references. Interim mitigations: restrict network access to canvas endpoints via firewall rules limiting exposure to trusted IP ranges, implement reverse proxy with mandatory authentication layer, disable canvas functionality if not operationally required. Monitor authentication logs for repeated failed canvas endpoint access patterns indicating exploitation attempts.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in npm
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Technical ContextAI · show details
Authentication function for canvas endpoints contains implementation flaw allowing authentication mechanism bypass. CWE-291 (Missing Authentication for Critical Function) indicates authentication check absent or incorrectly enforced. CVSS AC:H suggests attack requires specific timing, conditions, or preparation despite network accessibility. Root cause in logic error rather than input validation weakness.
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Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
OpenClaw Canvas Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of OpenClaw. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the implementation of the the authentication function for canvas endpoints. The issue results from improper implementation of authentication. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-29311.
Executive ViewAI
CVE-2026-3690 affects OpenClaw canvas endpoints, allowing unauthenticated remote attackers to bypass authentication controls and access sensitive data or modify system state without credentials. This vulnerability exposes canvas functionality to direct attack from the internet and poses immediate risk to data confidentiality and integrity for any organization deploying OpenClaw.
No vendor-released patch identified at time of analysis. Interim mitigations: (1) Restrict network access to OpenClaw canvas endpoints via firewall/network segmentation to authorized internal networks only; (2) Deploy Web Application Firewall (WAF) rules to monitor and block suspicious authentication bypass attempts to canvas endpoints; (3) Enable detailed logging and alerting on canvas endpoint access attempts; (4) Consider disabling canvas functionality entirely if not operationally critical until patch is available.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
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