CVE WatchJul 30, 2026

CVE-2026-66420

MeshCentral 1.1.21 contains a cross-site WebSocket hijacking protection bypass vulnerability that allows unauthenticated remote attackers to

CVSS

8.8

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Jul 30, 2026 · Last modified: Jul 30, 2026 · CWE-346

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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