OpenClaw Authentication Bypass: Critical Vulnerability in Feishu Webhook
The National Vulnerability Database has disclosed CVE-2026-44109, a critical authentication bypass vulnerability in OpenClaw before version 2026.4.15. This flaw impacts the validation mechanisms for Feishu webhooks and card-actions, allowing unauthenticated requests to directly reach command dispatch functions. With a CVSS score of 9.8, this vulnerability presents a severe risk.
The core issue, as detailed by the National Vulnerability Database, stems from a ‘fail open’ design flaw. Missing encryptKey configurations and blank callback tokens do not reject requests; instead, they allow them to proceed. This enables attackers to bypass signature verification and replay protection, paving the way for arbitrary command execution. The implications are clear: a complete compromise of the affected system without any prior authentication.
This isn’t theoretical. An attacker leveraging this vulnerability can execute commands on the system, potentially leading to data exfiltration, system takeover, or further lateral movement within an environment. The ease of exploitation, coupled with the critical impact, makes this a high-priority concern for any organization utilizing OpenClaw with Feishu integrations.
What This Means For You
- If your organization uses OpenClaw with Feishu integrations, you need to immediately patch to version 2026.4.15 or later. This is not a 'monitor for exploitation' scenario; it's a 'patch now' directive. An unauthenticated attacker can bypass all security controls and execute arbitrary commands. Verify your `encryptKey` configurations are robust and callback tokens are properly managed to prevent this 'fail open' scenario.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-44109 - OpenClaw Feishu Webhook Authentication Bypass
title: CVE-2026-44109 - OpenClaw Feishu Webhook Authentication Bypass
id: scw-2026-05-06-ai-1
status: experimental
level: critical
description: |
This rule detects attempts to exploit CVE-2026-44109 by targeting the Feishu webhook endpoint. The vulnerability allows unauthenticated requests to reach command dispatch due to missing encryptKey configuration and blank callback tokens. This detection specifically looks for POST requests to '/webhook' with 'msg_type=interactive' in the query string, which are indicative of an attempt to trigger the vulnerable functionality.
author: SCW Feed Engine (AI-generated)
date: 2026-05-06
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-44109/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/webhook'
cs-method|exact:
- 'POST'
cs-uri-query|contains:
- 'msg_type=interactive'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-44109 | Auth Bypass | OpenClaw before 2026.4.15 |
| CVE-2026-44109 | Auth Bypass | Feishu webhook and card-action validation |
| CVE-2026-44109 | Auth Bypass | Missing encryptKey configuration |
| CVE-2026-44109 | Auth Bypass | Blank callback tokens |
| CVE-2026-44109 | RCE | Execute arbitrary commands via signature verification and replay protection bypass |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 06, 2026 at 23:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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