PT-2026-49757 · Openclaw · Openclaw

Edward-X · Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-53840

Mitre

CVSS v3.1

7.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

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.

Fix

Insufficiently Protected Credentials

Weakness Enumeration

CWE-522

Related Identifiers

CVE-2026-53840

Affected Products

Openclaw

References · 3

• https://github.com/openclaw/openclaw/security/advisories/GHSA-rjxq-qqhf-8hwh · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-53840 · Security Note
• https://vulncheck.com/advisories/openclaw-custom-header-leakage-via-mcp-streamable-http-cross-origin-redirects · Note