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OpenClaw CVE-2026-53859

| EUVDEUVD-2026-37161 MEDIUM
Incomplete Comparison with Missing Factors (CWE-1023)
2026-06-16 VulnCheck GHSA-gxg4-2rrr-jhc7 GHSA-vqx6-6j84-2794
Authentication Bypass Openclaw
6.0
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.0 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/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
vuln.today AI
6.5 MEDIUM

Network-accessible exploit requires authenticated access (PR:L); trailing-dot technique is trivially simple (AC:L) once authenticated; scope unchanged with no integrity or availability impact.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:P/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
X

Lifecycle Timeline

2
Patch available
Jun 16, 2026 - 20:02 EUVD
Analysis Generated
Jun 16, 2026 - 19:02 vuln.today

DescriptionCVE.org

OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through hostname policies.

AnalysisAI

Hostname blocklist bypass in OpenClaw before 2026.5.26 enables authenticated attackers to reach operator-restricted network destinations by supplying trailing-dot notation in model- or workspace-derived URLs. The comparison logic evaluating hostnames against blocklist policies does not normalize fully qualified domain name (FQDN) trailing dots before evaluation, while DNS resolvers treat blocked.example.com. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to OpenClaw as low-privileged user
Delivery
Identify active hostname blocklist policy targets
Exploit
Craft URL with trailing-dot hostname (e.g., blocked-host.internal.)
Execution
Submit request bypassing blocklist string comparison
Persist
DNS resolves trailing-dot hostname to blocked destination
Impact
Retrieve confidential data from restricted endpoint
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated session in OpenClaw (confirmed by PR:L in the CVSS 4.0 vector) with the ability to supply or influence model-derived or workspace-derived URLs - this is the specific attack surface named in the CVE description. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.0 with vector AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N positions this as a medium-severity finding despite a High confidentiality rating. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated OpenClaw user who can specify model- or workspace-derived URL targets identifies that `internal-api.corp.example.com` is on the operator's blocklist. The attacker submits the URL `internal-api.corp.example.com.` (with trailing dot); the blocklist comparison fails to match the modified string against the blocked entry and permits the outbound request, which DNS resolves to the same address as the blocked host. …
Remediation Upgrade OpenClaw to version 2026.5.26 or later, as documented in the vendor security advisory at https://github.com/openclaw/openclaw/security/advisories/GHSA-gxg4-2rrr-jhc7. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-53859 vulnerability details – vuln.today
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