What is CVE-2026-53840?

CVE-2026-53840 is a high-severity vulnerability in Openclaw, classified under Insufficiently Protected Credentials. CVSS score: 7.1/10. Published 2026-06-16.

How severe is CVE-2026-53840?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Openclaw

CVE-2026-53840

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…

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.

Affected products

Openclaw — versions 0, 2026.5.12

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-53840?: CVE-2026-53840 is a high-severity vulnerability in Openclaw, classified under Insufficiently Protected Credentials. CVSS score: 7.1/10. Published 2026-06-16.
How severe is CVE-2026-53840?: High severity. CVSS v3 base score is 7.1 out of 10.