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CVE-2026-66420— MeshCentral Cross-Site WebSocket Hijacking via Origin Validation Bypass on Self-Signed Certificate Deployments

CVSS 8.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
YlianstMeshCentral1.1.21affected
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I. Basic Information for CVE-2026-66420

Vulnerability Information
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Vulnerability Title
MeshCentral Cross-Site WebSocket Hijacking via Origin Validation Bypass on Self-Signed Certificate Deployments
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
YlianstMeshCentral 1.1.21 -

II. Public POCs for CVE-2026-66420

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9594 chars
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III. Intelligence Information for CVE-2026-66420

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Patches & Fixes for CVE-2026-66420 (2)

News Coverage for CVE-2026-66420 (1)

Other References for CVE-2026-66420 (1)

IV. Related Vulnerabilities

Same product: MeshCentral
Same vendor: Ylianst
Same weakness: CWE-346

V. Comments for CVE-2026-66420

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