CVE-2026-53840
HIGH
NVD
CVSS Score
7.1
Severity
HIGH
Published
Jun 16, 2026
Vendor
unknown
Description
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.