CVE-2026-53840

High

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.

SeverityHigh

CVSS7.1

Exploit probability—

ProductOpenclaw

PublishedJun 16, 2026

First seenJun 16, 2026

Weakness typeCWE-522CWE-522

How to fix

Update

openclaw openclaw2026.5.12 or later
openclaw2026.5.12 or later

Vendor advisories

github.com/openclaw/openclaw/security/advisories/GHSA-rjxq-qqhf-8hwh

Affected products

Product	Affected versions	Fixed in
openclaw openclaw	v < 2026.5.12, 2026.5.12	2026.5.12
openclawnpm	v < 2026.5.12	2026.5.12

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