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BREW-openclaw-cli-CVE-2026-53840 — OpenClaw: MCP Streamable HTTP redirects could forward configured custom headers to another origin

Affected: Homebrew: openclaw-cli

### Summary

OpenClaw supports remote MCP Streamable HTTP servers with operator-configured custom headers. In affected releases, those headers could be forwarded when the MCP endpoint responded with a cross-origin redirect.

This issue is limited to configured MCP Streamable HTTP servers that use custom headers. It does not expose unrelated OpenClaw credentials.

### Affected configurations

This affects deployments where an MCP server is configured with:

- `transportType: "streamable-http"` - sensitive custom headers under `mcp.servers.*.headers` - an MCP endpoint that is malicious, compromised, or able to redirect to another origin

### Impact

Custom MCP headers, such as API keys or tenant-routing headers, could be sent to the redirect target. The exposed credential scope depends on the header the operator configured for that MCP server.

### Patched Versions

The first stable patched version is `2026.5.12`.

### Mitigations

Upgrade to `openclaw@2026.5.8` or later. Before upgrading, avoid custom MCP headers with servers you do not fully trust, and rotate any MCP-specific credentials that may have been exposed by a redirecting endpoint.

EUVD-2026-327790

fkie_cve-2026-53840

OpenClaw before 2026.5.12 contains an information disclosure vulnerability in streamable-http MCP servers that forwards operator-configured custom headers during cross-origin redirects. Attackers controlling or compromising an MCP endpoint can redirect requests to exfiltrate sensitive headers like API keys or tenant-routing credentials to attacker-controlled origins.

GHSA-rjxq-qqhf-8hwh — OpenClaw: MCP Streamable HTTP redirects could forward configured custom headers to another origin

Affected: npm: openclaw