Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 12.7%
CVSS Severity
CVSS v3 Score 7.1