Executive Summary

CVE-2026-44996 is an arbitrary local file read vulnerability in OpenClaw versions before 2026.4.15. It occurs in the webchat audio embedding helper, which fails to properly enforce local media root containment checks. This flaw allows attackers to manipulate the ReplyPayload.mediaUrl parameter to reference absolute local file paths or file URLs. As a result, attackers can read audio-like files from the local filesystem and embed their base64-encoded contents into webchat responses.

The vulnerability is related to path traversal (CWE-22) and improper access control, enabling unauthorized reading of local files within the permissions of the gateway process.

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Impact Analysis

This vulnerability can allow attackers to read arbitrary local audio-like files on the server running OpenClaw, potentially exposing sensitive information contained in those files. The contents of these files can be embedded and exposed in webchat responses, which could lead to information disclosure.

Since the vulnerability bypasses local media root containment checks, attackers might access files outside intended directories, increasing the risk of unauthorized data exposure. However, the files must be readable by the gateway process, have audio-like extensions, and fit within size limits to be exploited.

The overall severity is considered moderate (CVSS v4 score 6.3), indicating a significant but not critical risk.

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Detection Guidance

This vulnerability involves manipulation of the ReplyPayload.mediaUrl parameter in OpenClaw webchat audio embedding to read arbitrary local files. Detection involves monitoring or inspecting webchat traffic for suspicious mediaUrl parameters that contain absolute local paths or file URLs.

You can detect attempts to exploit this vulnerability by searching logs or network captures for webchat requests containing mediaUrl parameters with file paths or file:// URLs.

• Use network traffic inspection tools (e.g., Wireshark, tcpdump) to filter HTTP requests to the webchat endpoint and look for mediaUrl parameters with suspicious local file paths.
• Search application logs for entries containing ReplyPayload.mediaUrl values that include absolute paths or file:// URLs.
• Example command to search logs for suspicious mediaUrl usage: grep -E 'mediaUrl=.*(file://|/)' /path/to/openclaw/logs/*
• Example tcpdump command to capture HTTP traffic on port 80 or 443 for analysis: tcpdump -i any -A 'tcp port 80 or tcp port 443' | grep 'mediaUrl='

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Mitigation Strategies

The primary mitigation is to upgrade OpenClaw to version 2026.4.15 or later, where the vulnerability has been patched by enforcing strict local media root containment checks on webchat audio embedding.

Until the upgrade can be applied, avoid exposing webchat sessions to untrusted users or content that could manipulate mediaUrl parameters.

• Apply the official patch or upgrade OpenClaw to version 2026.4.15 or newer.
• Restrict access to the webchat interface to trusted users only.
• Implement network-level controls or web application firewall (WAF) rules to block requests containing suspicious mediaUrl parameters with absolute local paths or file:// URLs.
• Review and monitor logs for attempts to exploit this vulnerability.

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Compliance Impact

The provided information does not explicitly address how CVE-2026-44996 affects compliance with common standards and regulations such as GDPR or HIPAA.

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