Cyber Resilience

CVE-2026-53837

Openclaw ≤ 2026.5.6

Public PoC
Published
12 June 2026
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v4 6.3
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/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 Score 0.0019 9th percentile
Risk Priority 30 floored blend · peak EPSS

Summary

CVE-2026-53837 is a medium-severity Failing Open (CWE-636) vulnerability in Openclaw Openclaw. Its CVSS base score is 6.3 (Medium).

Operationally, ranked at the 9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to CP-12 (Safe Mode) and SC-24 (Fail in Known State) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A10:2025 Mishandling of Exceptional Conditions

EU & UK References

Vulnerability Data

OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events missing channel type information to process restricted content.

CWE(s)
CWE-636

Related Threats

CVEs Like This One

CVE-2026-41334Same product: Openclaw Openclaw
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CVE-2026-42423Same product: Openclaw Openclaw
CVE-2026-53852Same product: Openclaw Openclaw
CVE-2026-32970Same product: Openclaw Openclaw
CVE-2026-41297Same product: Openclaw Openclaw
CVE-2026-43570Same product: Openclaw Openclaw
CVE-2026-41298Same product: Openclaw Openclaw
CVE-2026-41392Same product: Openclaw Openclaw
CVE-2026-35626Same product: Openclaw Openclaw

Affected Assets

openclaw
openclaw
≤ 2026.5.6

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.2.1
  • V7.4.1
  • V8.3.3
  • V10.3.4

Mitigating Controls (NIST 800-53 r5) AI

SC-24 Fail in Known State good match

SC-24 directly requires the system to fail to a known state that preserves security properties, structurally stopping fallback to a less-secure mode.

SI-17 Fail-safe Procedures good match

SI-17 mandates explicit fail-safe procedures that activate on indicated failures, preventing the insecure fallback behavior.

CP-12 Safe Mode good match

CP-12 forces entry into a safe mode on detected conditions, limiting exposure but not covering every failure path.

SA-8 Security and Privacy Engineering Principles partial match

SA-8 requires application of engineering principles that include fail-secure design, reducing the likelihood the weakness is introduced.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure-development practices explicitly include designing error and failure handling to remain in a secure state.

PR.AA-05 partial match
prevents

Least-privilege policy and enforcement directly counters the permissive-access fallback example in the CWE.

PR.PS-01 partial match
prevents

Hardened baselines and configuration management reduce the chance that error paths default to insecure settings.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.25 Assessment and decision on information security events none match
none

The control forces an explicit evaluation step before any response, reducing the chance that a failure condition will default to an unsafe open state.

References