CVE-2026-53863: OpenClaw Input Validation Bypass Allows Unauthorized Tool Access

Technical summary

CVE-2026-53863 is an input validation vulnerability affecting OpenClaw's tool group policy resolution mechanism. The vulnerability stems from insufficient validation of group ID parameters passed to policy callers. Attackers who can authenticate to the system (PR:L per CVSS vector) can supply malicious or unexpected group IDs that bypass the policy resolver's access control logic, resulting in privilege escalation or tool invocation outside intended authorization boundaries. The vulnerability is classified under CWE-639 (Authorization Through User-Controlled Key), indicating a design flaw where user-supplied data directly influences access decisions without proper verification.

Business impact

This vulnerability poses a significant risk to organizations relying on OpenClaw for tool access governance and authorization. An authenticated user could escalate their privileges by manipulating group identifiers, gaining unauthorized access to restricted tools or capabilities. The impact extends beyond individual user actions—compromised access controls could affect audit trails, compliance posture, and tool execution logs. Organizations using OpenClaw in security-sensitive workflows (deployment orchestration, system administration, or infrastructure automation) face elevated risk of unauthorized actions that may go undetected if group policy enforcement is a key security layer.

Affected systems

OpenClaw before version 2026.4.25 is affected. The vulnerability impacts all deployments of vulnerable OpenClaw versions where tool group policies are enforced through group ID resolution. Any system accepting tool invocation requests from authenticated users is potentially exploitable if those users can influence or inject group ID parameters into policy decisions.

Exploitability

The attack requires valid authentication credentials (PR:L), placing it within reach of insiders or users with compromised accounts. No user interaction is required (UI:N), and the vulnerability is easily reachable over the network (AV:N) with low attack complexity (AC:L), making it straightforward to exploit once an attacker is authenticated. The lack of complexity suggests the vulnerability does not require sophisticated exploitation techniques or race conditions. The CVSS score of 7.1 (HIGH) reflects the moderate barrier to entry (authentication required) combined with high integrity impact through unauthorized tool invocations.

Remediation

Upgrade OpenClaw to version 2026.4.25 or later, which contains fixes for group ID validation in the policy resolver. Organizations unable to upgrade immediately should review and strengthen authentication controls to limit who can access OpenClaw, and implement network segmentation to restrict access to the application. Consider enabling additional audit logging to detect suspicious group ID manipulations or unexpected tool invocations.

Patch guidance

Apply the update to OpenClaw 2026.4.25 or newer as soon as feasible. Verify the update is applied by checking the application version in your OpenClaw deployment. Test the patched version in a non-production environment first to ensure compatibility with your existing tool policies and configurations. After deployment, re-validate that tool group policies are enforced correctly and that users can only invoke tools matching their assigned groups.

Detection guidance

Monitor OpenClaw logs for policy resolution errors, particularly failed access attempts where the group ID does not match the authenticated user's assigned groups. Look for repeated attempts to invoke tools with mismatched or unexpected group identifiers. Network intrusion detection systems should flag requests with malformed or suspicious group ID parameters sent to the policy resolver endpoint. Compare user tool invocation logs against their assigned group memberships to identify unauthorized access patterns. If available, enable detailed policy decision logging to capture the group IDs being evaluated.

Why prioritize this

This vulnerability merits prompt attention because it directly undermines access control enforcement—a foundational security control. The combination of network accessibility, low attack complexity, and the ability to bypass authorization decisions with authenticated access makes it a practical risk. While the attack requires valid credentials, insider threats and credential compromise are common threats. Organizations should prioritize patching based on the sensitivity of tools protected by OpenClaw and the risk profile of their user base.

Risk score, explained

The CVSS 3.1 score of 7.1 (HIGH) reflects: network reachability (AV:N) and low attack complexity (AC:L) lower the barrier to exploitation; authentication requirement (PR:L) prevents unauthenticated attacks but is not an insurmountable barrier; no user interaction required (UI:N) means attacks can be automated; unchanged scope (S:U) indicates the vulnerability does not cross trust boundaries; low confidentiality impact (C:L) reflects potential information disclosure through unauthorized tool access; high integrity impact (I:H) is the primary concern, as tool invocation outside authorized groups can alter system state or behavior. The score appropriately prioritizes integrity over confidentiality, reflecting the nature of tool misuse as a primary threat.

Frequently asked questions