OpenClaw Security Vulnerability: CVE-2026-25253 (ClawBleed) Analysis

OpenClaw "ClawBleed" (CVE-2026-25253): The Token Leak Behind the One Click RCE Nightmare

Published: 2026-02-07

OpenClaw Vulnerability Analysis from Securelic Team

OpenClaw CVE-2026-25253 Vulnerability Analysis

Executive Summary

The era of "Agentic AI" and autonomous security orchestration has hit a critical stumbling block. A catastrophic vulnerability, officially designated as CVE-2026-25253, has been discovered in OpenClaw, the industry standard open source automation agent.

Dubbed "ClawBleed" by the research community, this flaw is not a traditional buffer overflow. It is a severe Information Disclosure and Broken Authentication issue where the OpenClaw agent inadvertently "bleeds" high privilege authentication tokens via its web interface. This exposure allows unauthenticated attackers to hijack the agent and achieve One-Click Remote Code Execution (RCE).

Reports from The Hacker News, Cisco and Trend Micro warn that this vulnerability exposes organizations to total infrastructure compromise, as attackers can weaponize the very AI agents designed to protect them.

What is OpenClaw? (The Agentic AI Context)

OpenClaw has evolved beyond a simple script runner into a full fledged "Agentic Assistant." It is an AI driven orchestration platform that autonomously manages security alerts, rotates cloud keys and patches vulnerabilities.

Why it is high risk:

  • High Privilege: To function, OpenClaw holds "Keys to the Kingdom" (AWS Roots, SSH Keys, Database Admin credentials).
  • Autonomous Action: It can execute code and modify infrastructure without human approval.
  • Always On: The OpenClaw dashboard and API are typically exposed to internal (and sometimes external) networks to receive webhooks.

As noted by Cisco's AI Security research, personal AI agents like OpenClaw create a "security nightmare" because they centralize risk: compromise the agent and you compromise everything it manages.

The Vulnerability: CVE-2026-25253 ("ClawBleed")

CVE ID: CVE-2026-25253

Vulnerability Type: Improper Output Neutralization for Logs / Sensitive Information Exposure (CWE-532) leading to RCE.

Severity: Critical (CVSS v3.1 Score: 9.8)

Root Cause Analysis

The vulnerability resides in how OpenClaw’s dashboard handles Session Tokens and OAuth States during the "One-Click" approval workflows.

OpenClaw introduced a feature to allow admins to approve actions via a simple URL click (e.g., "Click here to block IP"). However, the Auth Token generation logic had a fatal flaw:

  • The Leak: When an admin views the "Live Activity" log or a specific error report, the backend reflects the full user session objectincluding the active Bearer Tokeninto the DOM of the page and the URL parameters of the API response.
  • The Exposure: This data is logged in plain text and often cached by intermediate proxies or browser history.
  • The Exploit: An attacker who can trigger an error (by sending a malformed webhook) can force the admin's dashboard to display a log entry that contains the admin’s own active session token.
  • This is why it is called "ClawBleed": The application is literally bleeding valid session tokens into logs and error messages, similar to how Heartbleed leaked memory contents.
  • The "1-Click" Attack ChainAccording to advisories from the CCB (Centre for Cybersecurity Belgium) and SOCRadar, the exploitation path is terrifyingly simple and relies on a "One-Click" interaction.

Step 1: The Trap (Reflected Token)

The attacker sends a malicious payload to the OpenClaw Webhook endpoint.

POST /api/webhook/trigger { "payload": "<malicious_data>" }

This payload is designed to fail and generate a verbose error log entry.

Step 2: The Phish

The attacker sends a link to the OpenClaw administrator (e.g., via a ticket or email):

"Hey, the automation system is throwing a weird error, can you check this log?"

Step 3: The Bleed & Hijack

  • When the admin clicks the link:
  • The dashboard loads the error log.
  • CVE-2026-25253 triggers: The malicious payload in the log executes a Cross Site Scripting (XSS) or simply exposes the token in the response body.
  • The attacker's script scrapes the Bearer Token and sends it to a C2 server.

Step 4: Remote Code Execution (RCE)

With the stolen Admin Token, the attacker authenticates to the OpenClaw API and uses the /api/v1/run-script endpoint to execute system commands as root.

Trend Micro highlights this as a key risk of "Agentic Assistants": The agent trusts the token implicitly, allowing the attacker to use the AI's capabilities to destroy the environment.

Impact Assessment

This is not just a data leak; it is a full system takeover.

  • Total Confidentiality Loss: Attackers can dump the OpenClaw "Vault," stealing AWS keys, Database passwords and API secrets.
  • Infrastructure Destruction: Attackers can use the agent to delete VM instances or wipe S3 buckets.
  • Supply Chain Infection: Attackers can modify the CI/CD pipelines managed by OpenClaw to inject malware into the company's software products.

Detection & Monitoring

Defenders must look for anomalies in API usage and Token patterns.

1. Log Analysis (SIEM):

Search for unusual access to the /api/logs or /api/error-report endpoints followed immediately by calls to /api/run-script or /api/execute from a different IP address.

2. Token Anomalies:

Detect if a single User Authentication Token is being used from two distinct geolocations simultaneously (e.g., The Admin in New York and the Attacker in Russia).

3. Payload Inspection:

Monitor incoming Webhooks for Javascript like syntax or unusual characters (<script>, javascript:, onerror=) which indicate an attempt to prime the log for the XSS/Token Bleed.

Mitigation & Hardening Strategies

University of Toronto's Security Advisory and CCB Belgium strongly recommend the following immediate actions:

1. Patch Immediately

Upgrade to OpenClaw v2.5.3 or later. This patch removes the verbose error logging and sanitizes the token handling in the dashboard.

2. Revoke and Rotate

  • Assume all active sessions are compromised.
  • Force logout all users.
  • Rotate the OpenClaw SECRET_KEY.
  • Crucial: Rotate all downstream credentials (AWS Keys, SSH Keys) stored in the OpenClaw Vault, as they may have been accessed.

3. Network Segmentation

Ensure OpenClaw is not accessible from the public internet. Access should be restricted to a VPN or a Zero-Trust Network Access (ZTNA) solution.

4. Disable "One-Click" Actions

In the configuration openclaw.yaml, set allow_url_actions: false.This disables the ability to trigger actions via GET requests, mitigating the "One-Click" vector described by The Hacker News.

Conclusion

CVE-2026-25253 serves as a wake up call for the "Agentic AI" era. When we centralize authority in an automated agent like OpenClaw, we create a single point of failure. The "ClawBleed" vulnerability demonstrates that even a simple data leak an exposed auth token can lead to total catastrophe when the compromised system has the power to reshape the infrastructure.

Security teams must treat their automation platforms with the same rigor as their Domain Controllers. Patch now, rotate your secrets and hide your agents.

References