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OpenClaw EUVDEUVD-2026-45108

| CVE-2026-62220 MEDIUM
Improper Restriction of Excessive Authentication Attempts (CWE-307)
2026-07-17 VulnCheck GHSA-vfpw-6fgp-w7h6
Authentication Bypass Openclaw
6.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/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
3.7 LOW

AT:P in CVSS 4.0 maps to AC:H in 3.1 - the feature must be enabled and reachable by lower-trust callers; impact is availability-only and low.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/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
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 17, 2026 - 02:32 EUVD
Analysis Generated
Jul 17, 2026 - 01:04 vuln.today

DescriptionCVE.org

OpenClaw 2026.2.25 before 2026.5.26 allow a lower-trust caller or configured input path to bypass non-browser rate limits on WebSocket authentication attempts. When the affected feature is enabled and reachable by lower-trust input, this can consume gateway resources and reduce service availability.

AnalysisAI

WebSocket authentication rate limit bypass in OpenClaw versions 2026.2.25 through pre-2026.5.26 enables lower-trust callers or configured non-browser input paths to flood authentication attempts without being throttled at the gateway layer. The impact is limited to availability - an attacker can consume gateway connection and compute resources, degrading service for legitimate users. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify exposed WebSocket auth endpoint
Delivery
Route requests via non-browser input path
Exploit
Send high-volume authentication attempts
Execution
Bypass non-browser rate limit enforcement
Persist
Exhaust gateway connection or compute resources
Impact
Degrade service availability for legitimate clients
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Vulnerability AssessmentAI

Exploitation The WebSocket authentication feature with non-browser rate limiting must be explicitly enabled in the OpenClaw configuration, and the affected input path must be reachable by a lower-trust caller - this is confirmed by both the CVE description ('when the affected feature is enabled and reachable by lower-trust input') and the CVSS 4.0 AT:P metric. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N) scores 6.3 and conveys a network-exploitable, low-complexity flaw with no required privileges or user interaction - but the AT:P qualifier is load-bearing: exploitation requires a specific attack target condition (the feature must be enabled and reachable by untrusted input). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated network actor directs a high volume of WebSocket authentication requests to an OpenClaw gateway where the affected non-browser rate-limit path is enabled and reachable from lower-trust input. Because the rate throttle is not enforced for this path, the gateway processes every attempt without gating, progressively consuming connection slots and compute capacity. …
Remediation Upgrade OpenClaw to version 2026.5.26 or later, which resolves the WebSocket authentication rate limit bypass per the vendor advisory at https://github.com/openclaw/openclaw/security/advisories/GHSA-5p6w-wmh3-frfr and the VulnCheck advisory at https://www.vulncheck.com/advisories/openclaw-websocket-rate-limit-bypass. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-45108 vulnerability details – vuln.today
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