CVE-2026-66420

HIGH 8.8

MeshCentral Cross-Site WebSocket Hijacking via Origin Validation Bypass on Self-Signed Certificate Deployments

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-346
Vendor	tugcantopaloglu
Product	openclaw-dashboard
Published	Jul 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

tugcantopaloglu / openclaw-dashboard

1.1.21

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Ylianst/MeshCentral/pull/7882 github.com: https://github.com/Ylianst/MeshCentral/commit/f04c9f4 github.com: https://github.com/Ylianst/MeshCentral vulncheck.com: https://www.vulncheck.com/advisories/meshcentral-cross-site-websocket-hijacking-via-origin-validation-bypass-on-self-signed-certificate-deployments

Credits

🔍 Ashish Kunwar (@D0rkerDevil)