CVE-2026-53835: OpenClaw Feishu Dynamic-Agent Binding Authorization Bypass

Technical summary

CVE-2026-53835 is an authorization bypass vulnerability (CWE-863: Improper Authorization) affecting OpenClaw's Feishu dynamic-agent binding mechanism. The vulnerability exists because the application fails to properly enforce config-write access controls when processing binding creation or update requests from authenticated users. An attacker who holds valid credentials can circumvent intended policy enforcement to modify sender-agent binding state, effectively bypassing authorization checks that ordinarily govern binding lifecycle operations.

Business impact

This vulnerability creates a compliance and operational risk for organizations using OpenClaw with Feishu integrations. Unauthorized binding modifications could allow insiders or compromised accounts to establish unapproved sender-agent communication paths, potentially enabling data exfiltration, unauthorized integrations, or policy circumvention without triggering expected audit controls. The impact is amplified in environments where role-based access controls are central to data governance or regulatory compliance.

Affected systems

OpenClaw versions prior to 2026.5.6 are affected. The vulnerability specifically targets the Feishu dynamic-agent binding feature; organizations using this integration should prioritize assessment. The flaw requires an attacker to hold valid authentication credentials, so the exposure is limited to authenticated users but still represents a significant insider risk vector.

Exploitability

The vulnerability has a CVSS v3.1 base score of 4.3 (MEDIUM severity) with a network-accessible vector (AV:N), low attack complexity (AC:L), and a requirement for low privilege (PR:L). No user interaction is needed (UI:N). While the score is moderate, the lack of elevation from a typical user role and the simplicity of exploitation via standard API calls make this practically exploitable by any authenticated user without special privileges. The vulnerability is not currently tracked in CISA's Known Exploited Vulnerabilities catalog.

Remediation

Upgrade OpenClaw to version 2026.5.6 or later to apply the authorization enforcement fix. Verify the patch version against the official vendor advisory prior to deployment. Organizations should also audit existing Feistel dynamic-agent bindings to detect any unauthorized or unexpected sender-agent relationships created while running vulnerable versions.

Patch guidance

Apply OpenClaw 2026.5.6 or newer in a controlled manner, testing in a non-production environment first to confirm compatibility with your Feishu integration configuration. Because this is an authentication and authorization control fix, it should be prioritized for prompt deployment. Verify patch integrity and test binding creation/modification workflows post-update to confirm proper enforcement of config-write policies.

Detection guidance

Monitor OpenClaw audit logs for unexpected dynamic-agent binding creation or modification events, particularly those initiated by user accounts with limited expected privilege levels. Search for binding updates that correlate with policy-restricted accounts or out-of-band user activities. Network monitoring can flag unusual Feishu API calls from your OpenClaw infrastructure. Consider implementing additional logging on binding lifecycle operations if not already present.

Why prioritize this

Although the CVSS score is moderate (4.3), this vulnerability directly undermines access control enforcement—a critical security function. The requirement for valid credentials limits random external exploitation but increases insider risk and the likelihood of abuse by compromised service accounts. For organizations where Feishu integration handles sensitive workflows or where policy enforcement is compliance-critical, this warrants prompt attention despite the moderate base score.

Risk score, explained

The CVSS v3.1 score of 4.3 reflects the availability of a network vector and low complexity, offset by the requirement for prior authentication. The impact is limited to integrity (I:L)—unauthorized binding modifications—with no confidentiality or availability impact. However, the real-world risk is elevated by the ease of exploitation and the sensitivity of what authorization bypass enables: circumventing intended policy controls. Organizations should weight this higher if Feishu bindings are central to data governance.

Frequently asked questions