CVE-2026-100534
Received Received - Intake

Authorization Bypass in OpenClaw Webhook TaskFlow

Publication date: 2026-09-26

Last updated on: 2026-09-26

Assigner: VulnCheck

Description
OpenClaw versions before 2026.8.1 contain an authorization bypass vulnerability in webhook TaskFlow cancellation that allows attackers to cancel unrelated sessions. An attacker with a webhook route secret can supply an arbitrary child session key to cancel ACP or subagent work outside the route's configured authority.

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Meta Information

Published
2026-09-26
Last Modified
2026-09-26
Generated
2026-09-26
AI Q&A
2026-09-26
EPSS Evaluated
N/A
NVD
CVE-2026-100534
EUVD
EUVD-2026-87516

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
openclaw openclaw to 2026.8.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

This vulnerability in OpenClaw versions before 2026.8.1 allows an attacker with a webhook route secret to cancel unrelated sessions by supplying an arbitrary child session key. It bypasses authorization checks, enabling cancellation of ACP or subagent work outside the route's configured authority without accessing session content.

Detection Guidance

To detect this vulnerability, check OpenClaw versions before 2026.8.1 by running: openclaw --version. Review webhook TaskFlow cancellation logs for unauthorized session cancellations or mismatched child session keys. Inspect network traffic for suspicious webhook requests with arbitrary session identifiers.

Impact Analysis

An attacker could disrupt unrelated sessions or tasks by cancelling them, potentially causing workflow interruptions or data processing delays. This requires low privileges and no user interaction but has high attack complexity.

Compliance Impact

This vulnerability does not directly impact GDPR or HIPAA compliance as it does not involve unauthorized access to personal or health data. However, session cancellation could disrupt workflows handling sensitive operations, potentially affecting operational integrity in regulated environments.

Mitigation Strategies

Upgrade OpenClaw to version 2026.8.1 or later immediately. Disable webhook TaskFlow cancellation on routes accessible to low-trust callers. Rotate all exposed webhook route secrets. Ensure child session identifiers are validated against parent session ownership before processing cancellations.

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