Information Exposure Affecting openclaw package, versions <2026.5.12
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-OPENCLAW-17394026
- published22 Jun 2026
- disclosed17 Jun 2026
- creditYLChen-007
Introduced: 17 Jun 2026
NewCVE-2026-53840 (opens in a new tab)How to fix?
Upgrade openclaw to version 2026.5.12 or higher.
Overview
openclaw is a 🦞 OpenClaw — Personal AI Assistant
Affected versions of this package are vulnerable to Information Exposure via the MCP Streamable HTTP process when custom headers are configured and the MCP endpoint responds with a cross-origin redirect. An attacker can obtain sensitive information, such as API keys or tenant-routing headers, by leveraging a malicious or compromised MCP endpoint that issues redirects to another origin. This is only exploitable if the MCP server is configured with transportType: "streamable-http", sensitive custom headers under mcp.servers.*.headers, and the MCP endpoint is malicious, compromised, or able to redirect to another origin.
Workaround
This vulnerability can be mitigated by avoiding the use of custom MCP headers with servers that are not fully trusted and rotating any MCP-specific credentials that may have been exposed by a redirecting endpoint.