What is CVE-2026-66420?

CVE-2026-66420 is a high-severity vulnerability in Tugcantopaloglu Openclaw-Dashboard, classified under Origin Validation Error. CVSS score: 8.8/10. Published 2026-07-30.

How severe is CVE-2026-66420?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Tugcantopaloglu Openclaw-Dashboard

CVE-2026-66420

MeshCentral 1.1.21 contains a cross-site WebSocket hijacking protection bypass vulnerability that allows unauthenticated remote attackers to hijack authenticated administrator sessions by exploiting an unconditional early return in the CheckWebServerOriginName() function within webserver.js when self-signed certificates are in use. Attackers can open cross-origin WebSocket connections to any of the twelve WebSocket endpoints, send crafted action commands to exfiltrate the server sessionKey used to sign session cookies, forge session tokens as arbitrary users, and gain full remote control of all managed devices governed by the MeshCentral instance.

EPSS: 0.002 (6.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Tugcantopaloglu Openclaw-dashboard — versions 1.1.21
Ylianst Meshcentral — versions 1.1.21

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

disclosure@vulncheck.com (product, patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-66420?: CVE-2026-66420 is a high-severity vulnerability in Tugcantopaloglu Openclaw-Dashboard, classified under Origin Validation Error. CVSS score: 8.8/10. Published 2026-07-30.
How severe is CVE-2026-66420?: High severity. CVSS v3 base score is 8.8 out of 10.