CVE-2026-53840High· 7.1▾ TwilightOpenClaw: MCP Streamable HTTP redirects could forward configured custom headers to another origin
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.2%
0.2% → 0.3%
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.
This affects deployments where an MCP server is configured with:
transportType: "streamable-http"mcp.servers.*.headersCustom 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.
The first stable patched version is 2026.5.12.
Upgrade to [email protected] 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.
openclaw < 2026.5.12Upgrade to a patched release:
openclaw 2026.5.12Connected by shared product, vendor, weakness, or advisory.
GHSA-x7cf-6gp3-q5f8Medium· 7.1Duplicate Advisory: MCP Streamable HTTP redirects could forward configured custom headers to another origin
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GHSA-9c3v-684m-579cMedium· 6.5OpenClaw MCP SSE redirects could forward Authorization headers
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