CVE-2026-53863: Openclaw Auth Bypass Vulnerability

CVE-2026-53863 Overview

CVE-2026-53863 is an input validation vulnerability in OpenClaw versions before 2026.4.25. The flaw exists in tool group policy callers that accept unvalidated group IDs from external input. Attackers who can supply a group ID to the policy resolver can trigger incorrect group-policy decisions for tool invocations. This behavior can bypass intended access controls within the OpenClaw runtime. The issue is classified under CWE-639 (Authorization Bypass Through User-Controlled Key).

Critical Impact
Authenticated attackers with low privileges can manipulate group-policy decisions to invoke tools they should not be authorized to use, undermining access control integrity in OpenClaw deployments.

Affected Products

OpenClaw versions prior to 2026.4.25 (Node.js distribution)
OpenClaw 2026.4.25 beta1 through beta11 pre-release builds
Deployments exposing the tool group policy resolver to untrusted callers

Discovery Timeline

2026-06-16 - CVE-2026-53863 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-53863

Vulnerability Analysis

OpenClaw exposes a tool group policy mechanism that decides whether a given tool invocation is permitted based on the group context of the caller. The policy resolver accepts a group identifier supplied by the caller and uses it to look up the applicable policy entry. Because the identifier is not validated against the authenticated principal's actual group membership, a caller can submit an arbitrary group ID and receive a policy decision tied to a group they do not belong to.

This is an authorization bypass through a user-controlled key. The control logic trusts the input as authoritative, conflating an identifier supplied by the caller with a verified attribute of the session. A low-privileged user can therefore obtain elevated tool invocation rights without changing their authenticated identity. See the VulnCheck Advisory for additional technical commentary.

Root Cause

The root cause is missing server-side validation between the caller's authenticated identity and the group ID parameter passed to the policy resolver. The resolver treats the group ID as ground truth rather than cross-checking it against the session's verified group memberships. This pattern matches CWE-639, where authorization is bound to a key that the requester can influence.

Attack Vector

An attacker with network access and low privileges sends a tool invocation request containing a group ID for a higher-privileged or unrelated group. The policy resolver retrieves the matching policy entry and authorizes the tool call. No user interaction is required, but a specific attack precondition must be present: the attacker must be able to reach a code path that forwards an attacker-controlled group ID into the policy caller. Refer to the GitHub Security Advisory for the affected call sites.

No verified public exploit code is available for this issue. The vulnerability mechanism is described in prose because no validated proof-of-concept has been published.

Detection Methods for CVE-2026-53863

Indicators of Compromise

Tool invocation logs showing a single authenticated user resolving policies against multiple distinct group IDs in a short window.
Successful tool calls whose effective group context does not match the caller's directory-verified group memberships.
Anomalous parameter values in requests to the policy resolver endpoint, including group IDs that do not exist in the deployment's group catalog.

Detection Strategies

Compare the group ID submitted in each tool invocation request against the authenticated session's verified group membership and alert on mismatches.
Baseline normal group ID usage per user account and flag deviations, particularly invocations referencing administrative or service group IDs.
Review audit logs for tool executions that succeeded despite the caller lacking direct membership in the resolved group.

Monitoring Recommendations

Forward OpenClaw policy resolver and tool invocation logs to a centralized logging or SIEM platform with OCSF normalization.
Track the version string of deployed OpenClaw instances and alert on any node running a build prior to 2026.4.25.
Monitor outbound activity from tools whose invocations were authorized via group-policy decisions to detect downstream abuse.

How to Mitigate CVE-2026-53863

Immediate Actions Required

Upgrade OpenClaw to version 2026.4.25 or later on all affected Node.js deployments.
Inventory every caller of the tool group policy resolver and confirm none pass attacker-controllable group IDs.
Rotate or review credentials for low-privileged accounts that had access to the policy resolver during the exposure window.

Patch Information

The maintainers addressed the issue in OpenClaw 2026.4.25. Patch details and the fix scope are documented in the GitHub Security Advisory GHSA-985f-72mj-8gf7. Operators running any beta of 2026.4.25 (beta1 through beta11) must move to the final 2026.4.25 release because the pre-release builds remain vulnerable.

Workarounds

Restrict network access to the OpenClaw policy resolver so only trusted internal services can reach it.
Add an authorization wrapper around tool group policy callers that re-derives the group ID from the authenticated session rather than accepting it from request input.
Disable optional tool groups that are not required for production workloads to reduce the attack surface until the patch is applied.

bash

# Upgrade OpenClaw to the patched release
npm install openclaw@2026.4.25

# Verify the installed version is at or above the fixed build
npm ls openclaw