VULNERABILITY INTELLIGENCE

CVE-2026-53840

CVSS score6 MEDIUM
EPSS probability0.22%
CISA KEVNot currently listed
Published2026-06-16
Last modified2026-06-17
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

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.

Weakness classification

  • CWE-522: Insufficiently Protected Credentials

Primary references