CVE-2024-12042Network attack vector

Stored XSS via unrestricted avatar HTML upload

Published Dec 13, 2024 · Updated Apr 8, 2026

Stored XSS in MStore API 4.16.4 and earlier allows remote authenticated users to execute scripts through uploaded avatar HTML. The profile-picture upload handler fails to reject HTML content before storing it as a publicly accessible profile image. Subscriber-level access is required, and execution occurs only when another user opens the uploaded file, allowing script access within that user's browser context.

CVSS severity5.4
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in MStore API 4.16.4 and earlier allows remote authenticated users to execute scripts through uploaded avatar HTML. The profile-picture upload handler fails to reject HTML content before storing it as a publicly accessible profile image. Subscriber-level access is required, and execution occurs only when another user opens the uploaded file, allowing script access within that user's browser context.

The record

CVE
CVE-2024-12042
Published
Dec 13, 2024
Updated
Apr 8, 2026
Vendor
FluxBuilder
Product
MStore API
Classifications
CWE-79, CWE-434, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <=4.16.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FluxBuilder · MStore APIversion=0 <=4.16.4

Published CVSS scores

5.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-434Unrestricted Upload of File with Dangerous Type
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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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