CVE-2026-53840

MEDIUM EPSS 12.8%
Published Jun 16, 20261w ago · Modified Jun 17, 20261w ago
6.0 CVSS 4.0
Medium
Find Similar
Published Jun 16, 2026 1w ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
6.0
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
12.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-522

Affected Products 9

VendorProductVersionRange
openclawopenclaw* <2026.5.12
openclawopenclaw2026.5.12any
openclawopenclaw2026.5.12any
openclawopenclaw2026.5.12any
openclawopenclaw2026.5.12any
openclawopenclaw2026.5.12any
openclawopenclaw2026.5.12any
openclawopenclaw2026.5.12any
openclawopenclaw2026.5.12any

References 2

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.