CVE-2023-53924Public exploitNetwork attack vector

Authenticated command execution via executable avatar upload

Published Dec 17, 2025 · Updated Dec 17, 2025

Unrestricted file upload in UliCMS 2023.1 allows remote authenticated users to execute commands through a malicious profile avatar. The UserController update path passes a .phar avatar to User::changeAvatar and User::processAvatar, which leaves the rejected upload in a web-accessible temporary directory. Any logged-in account able to edit its profile can request the disclosed temporary URL, causing the PHP payload to run with the web server's privileges.

CVSS severity8.7
High
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unrestricted file upload in UliCMS 2023.1 allows remote authenticated users to execute commands through a malicious profile avatar. The UserController update path passes a .phar avatar to User::changeAvatar and User::processAvatar, which leaves the rejected upload in a web-accessible temporary directory. Any logged-in account able to edit its profile can request the disclosed temporary URL, causing the PHP payload to run with the web server's privileges.

The record

CVE
CVE-2023-53924
Published
Dec 17, 2025
Updated
Dec 17, 2025
Vendor
UliCMS
Product
UliCMS
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 17, 2025Record 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=2023.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

UliCMS · UliCMSversion=2023.1

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo