4.9

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2026-42438

CVE-2026-42438: OpenClaw 2026.4.9 < 2026.4.10 - Sender Policy Bypass in Host Media Attachment Reads

OpenClaw versions 2026.4.9 before 2026.4.10 contain a sender policy bypass vulnerability in the outbound host-media attachment read helper that allows unauthorized local file disclosure. Attackers with denied read access via toolsBySender or group policy can trigger host-media attachment loading to bypass sender and group-scoped authorization boundaries and retrieve readable local files through the outbound media path.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-42438

CVE-2026-42438:

4.9

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
openclaw	npm	>= 2026.4.9, < 2026.4.10	2026.4.10

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in a failure to enforce sender-specific authorization policies for reading local files via host-media attachments. A sender who was explicitly denied 'read' access through a toolsBySender policy could still trigger the reading of local files. This was possible because the function createAgentScopedHostMediaReadFile, which is responsible for creating the file read capability, did not check these sender-specific policies. The vulnerability was fixed by propagating the sender's context throughout the call chain, from message handling down to the media access layer. The function createAgentScopedHostMediaReadFile was updated to use a new function, isAgentScopedHostMediaReadAllowed, which now performs the necessary policy checks based on the sender's identity and the session context before granting file read access. The function resolveAgentScopedOutboundMediaAccess was also updated to accept and pass this new context.

Vulnerable functions

createAgentScopedHostMediaReadFile

src/media/read-capability.ts

This function was responsible for creating the host media read capability (`readFile`). Before the patch, it did not check sender-specific tool policies, allowing a sender denied `read` access to obtain the `readFile` capability and read local files. The patch introduces the `isAgentScopedHostMediaReadAllowed` check to enforce the policy.

resolveAgentScopedOutboundMediaAccess

src/media/read-capability.ts

This function resolves outbound media access and calls `createAgentScopedHostMediaReadFile`. It was vulnerable because it failed to pass the necessary sender context to `createAgentScopedHostMediaReadFile`, thereby preventing proper authorization checks. The patch adds the sender context to the parameters and passes it down.

Vulnerability Intelligence
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WAF Rule

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Reasoning

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