What is CVE-2026-35656?

CVE-2026-35656 is a medium-severity vulnerability in Openclaw, classified under Authentication Bypass by Spoofing. CVSS score: 6.5/10. Published 2026-04-10.

How severe is CVE-2026-35656?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Openclaw

CVE-2026-35656

OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.

EPSS: 0.003 (23.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Openclaw — versions 0, 2026.3.22

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

disclosure@vulncheck.com (vendor-advisory, Vendor Advisory, third-party-advisory)
disclosure@vulncheck.com (Patch, patch)
disclosure@vulncheck.com (Patch, patch)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-35656?: CVE-2026-35656 is a medium-severity vulnerability in Openclaw, classified under Authentication Bypass by Spoofing. CVSS score: 6.5/10. Published 2026-04-10.
How severe is CVE-2026-35656?: Medium severity. CVSS v3 base score is 6.5 out of 10.