CVE-2026-32895 in OpenClaw
Summary
by MITRE • 03/21/2026
OpenClaw versions prior to 2026.2.26 fail to enforce sender authorization in member and message subtype system event handlers, allowing unauthorized events to be enqueued. Attackers can bypass Slack DM allowlists and per-channel user allowlists by sending system events from non-allowlisted senders through message_changed, message_deleted, and thread_broadcast events.
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Analysis
by VulDB Data Team • 03/27/2026
The vulnerability identified as CVE-2026-32895 affects OpenClaw versions before 2026.2.26 and represents a critical authorization bypass flaw within the system's event handling mechanisms. This weakness stems from insufficient validation of sender permissions in member and message subtype system event handlers, creating a pathway for malicious actors to exploit the platform's access controls. The vulnerability specifically impacts Slack integration features where DM allowlists and per-channel user allowlists are implemented as security controls to restrict message delivery and system event propagation.
The technical implementation flaw manifests in the message_changed, message_deleted, and thread_broadcast event handlers which fail to properly authenticate the originating sender before processing system events. This authorization failure allows attackers to enqueue unauthorized events by leveraging these legitimate event types as attack vectors. The vulnerability operates at the application layer and specifically targets the event processing pipeline where system events are handled and routed through the platform's messaging infrastructure. According to CWE classification, this represents a weakness in authorization enforcement where the system fails to verify that events originate from authorized sources before processing them.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data exposure and privilege escalation within Slack environments. Attackers can exploit this flaw to bypass security controls designed to prevent communication between specific users or channels, effectively circumventing the intended access restrictions that organizations rely upon for secure messaging. This authorization bypass enables malicious actors to send system events from non-allowlisted senders, potentially leading to unauthorized message propagation, information disclosure, or disruption of normal communication flows within protected Slack channels and direct messages.
Organizations utilizing OpenClaw with affected versions face significant security risks as this vulnerability undermines the fundamental security model of Slack's access control mechanisms. The attack vector leverages legitimate system events that are typically trusted and processed without additional verification, making detection more challenging. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation and defense evasion techniques where attackers establish persistent access through legitimate system processes. The remediation approach requires immediate patching to version 2026.2.26 or later, alongside implementation of additional monitoring for unauthorized event processing and review of existing access control policies.
Security teams should implement comprehensive monitoring of system event handlers to detect anomalous processing patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of validating all event sources regardless of event type, particularly in environments where access controls are implemented at the channel or user level. Organizations should also consider implementing additional layers of authentication verification for system event processing and establish incident response procedures specifically targeting unauthorized event processing. This vulnerability highlights the critical need for robust authorization controls in event-driven architectures where system events form the foundation of communication and access management within collaborative platforms.