CVE-2026-53814: OpenClaw Privilege Escalation via Hook-Triggered Agent Scope Mismatch

Technical summary

CVE-2026-53814 is a privilege escalation vulnerability rooted in improper scope assignment during hook-triggered agent invocation in OpenClaw. The vulnerability exists in how MCP (Model Context Protocol or similar) loopback authority is granted to spawned processes. When a hook triggers agent execution via the /hooks/agent endpoint, the resulting CLI runtime receives owner-scoped MCP authority instead of hook-scoped authority, violating the principle of least privilege. This allows an attacker with a valid hook token to invoke owner-only MCP tools and execute actions reserved for the account owner, including manipulation of persistent cron state. The root cause maps to CWE-266 (Incorrect Privilege Assignment), indicating a flaw in the permission model enforcement.

Business impact

This vulnerability allows threat actors with hook credentials to escalate privileges and gain persistent access to critical system operations. Attackers could establish persistent backdoors through cron manipulation, potentially maintaining access even after detection and remediation of initial compromise. The impact extends beyond the compromised hook to the entire owner account's capabilities, creating a single point of failure for organizations relying on hook-based automation. For platforms where hooks are issued to third-party integrations or exposed via API, the blast radius is significantly larger.

Affected systems

OpenClaw versions prior to 2026.5.20 are affected. Organizations should verify their current version and prioritize upgrades. The vulnerability requires a valid hook token to exploit, so the risk is elevated in environments where hooks are shared with external systems, third-party integrations, or generated for service accounts with broad distribution.

Exploitability

Exploitation requires an attacker to possess a valid hook token, which is a somewhat elevated bar compared to unauthenticated attacks. However, hook tokens are often generated for integration purposes and may be stored in less-protected locations (environment variables, configuration files, logs) than primary credentials. Network access to the OpenClaw instance is required, but the CVSS vector indicates no special conditions or user interaction are needed. Once a hook token is obtained, the attack is straightforward: invoke the /hooks/agent endpoint with a malicious payload to access owner-scoped MCP tools. The vulnerability has not been listed on CISA's KEV (Known Exploited Vulnerabilities) catalog as of the last update, but this does not indicate absence of active exploitation.

Remediation

Upgrade to OpenClaw version 2026.5.20 or later. This version corrects the scope assignment logic to ensure hook-triggered agents receive hook-appropriate authority rather than owner-scoped authority. Organizations should prioritize this patch immediately given the HIGH severity and privilege escalation nature of the flaw. Before patching, audit hook token distribution and revoke any that are no longer actively needed.

Patch guidance

Apply the patch to OpenClaw 2026.5.20 or later across all instances. Verify the patch has been applied by confirming the version string and checking release notes for confirmation of the scope assignment fix. Test in a non-production environment first if possible. No special configuration changes are noted as necessary post-patch, but operators should verify that existing hooks continue to function at the intended scope level after the upgrade.

Detection guidance

Monitor for suspicious invocations of the /hooks/agent endpoint, particularly those followed by MCP tool calls that are normally owner-restricted (e.g., cron-related operations). Log and alert on any hook-triggered agents that attempt to access owner-scoped MCP tools. Review hook token usage logs for unexpected or unusual patterns. Audit cron job modifications during the vulnerability window to identify any unauthorized persistent changes. Organizations using endpoint detection and response (EDR) tools should monitor for unexpected CLI runtime spawning from OpenClaw processes with elevated capability grants.

Why prioritize this

This vulnerability merits immediate attention due to its HIGH CVSS score (8.3), privilege escalation nature, and potential for persistence through cron manipulation. The combination of high confidentiality and integrity impact with a relatively low barrier to exploitation (requires hook token but low attack complexity) places it in the critical remediation tier. Organizations should patch within days, not weeks.

Risk score, explained

The CVSS 3.1 score of 8.3 (HIGH) reflects: network-based attack vector, low attack complexity (straightforward exploitation once token is obtained), requirement for low privileges (valid hook token), no user interaction, unchanged scope, and high impact on confidentiality and integrity with low impact on availability. The score appropriately weights the privilege escalation and persistence implications of cron state modification.

Frequently asked questions