CVE-2026-53840

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.1 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N                                    

Vulnerability 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.

Vulnerability Details

Published Date

June 16, 2026

Last Modified

June 16, 2026

CWE ID

CWE-522

Source

NVD

Vendor

OpenClaw

Product

OpenClaw

External References

https://github.com/openclaw/openclaw/security/advisories/GHSA-rjxq-qqhf-8hwh
https://www.vulncheck.com/advisories/openclaw-custom-header-leakage-via-mcp-streamable-http-cross-origin-redirects

CVE-2026-53840

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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