CVE-2026-53840: Openclaw

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Openclaw Openclaw: before 2026.5.12 (fixed in 2026.5.12); version 2026.5.12 only

Published 2026-06-16. Last modified 2026-06-17.