CVE Catalog

CVE-2026-66420

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.17%

6th percentile - higher than 6% of all known CVEs

Summary

MeshCentral 1.1.21 contains a cross-site WebSocket hijacking protection bypass vulnerability. An unauthenticated remote attacker can hijack authenticated administrator sessions by exploiting an early return in CheckWebServerOriginName() in webserver.js when self-signed certificates are used. Attackers can open cross-origin WebSocket connections, exfiltrate the server sessionKey, forge session tokens, and gain full remote control of all managed devices.

Risk Assessment

An unauthenticated attacker can fully compromise the MeshCentral instance and all managed devices, posing a critical risk to infrastructure security.

Recommendation

Upgrade MeshCentral to a patched version, or apply temporary mitigations such as using certificates from a trusted certificate authority.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS