CVE-2024-42366Public exploitNetwork attack vector

Remote code execution via unescaped overlay identity

Published Aug 8, 2024 · Updated Aug 9, 2024

Remote code execution in VRCX before 2024.03.23 allows remote authenticated users to execute local programs through overlay notifications. The overlay renderer inserts a spoofed VRChat display name into Noty HTML without escaping, and its CefSharp context exposes AppApi.StartGameFromPath to that script. Exploitation requires a crafted VRChat log entry to trigger an overlay while the victim uses the HMD, after which the process runs with VRCX user privileges.

CVSS severity9.1
Critical
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in VRCX before 2024.03.23 allows remote authenticated users to execute local programs through overlay notifications. The overlay renderer inserts a spoofed VRChat display name into Noty HTML without escaping, and its CefSharp context exposes AppApi.StartGameFromPath to that script. Exploitation requires a crafted VRChat log entry to trigger an overlay while the victim uses the HMD, after which the process runs with VRCX user privileges.

The record

CVE
CVE-2024-42366
Published
Aug 8, 2024
Updated
Aug 9, 2024
Vendor
VRCX Team
Product
VRCX
Classifications
CWE-269, CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 9, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2024.03.23
  2. Affected versionversion=< 2024.03.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

VRCX Team · VRCXversion=0 <2024.03.23; version=< 2024.03.23

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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