CVE-2023-53885Public exploitNetwork attack vector

Authenticated command execution via unrestricted PHAR upload

Published Dec 15, 2025 · Updated Dec 15, 2025

Unrestricted file upload in Webutler 3.2 allows remote authenticated users with administrator access to execute arbitrary system commands. The admin media browser's index.php upload handler accepts a .phar file and stores it where a subsequent HTTP request invokes its embedded PHP. Administrator credentials are required, and successful exploitation grants command execution with the web server process's privileges.

CVSS severity7.2
High
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Webutler 3.2 allows remote authenticated users with administrator access to execute arbitrary system commands. The admin media browser's index.php upload handler accepts a .phar file and stores it where a subsequent HTTP request invokes its embedded PHP. Administrator credentials are required, and successful exploitation grants command execution with the web server process's privileges.

The record

CVE
CVE-2023-53885
Published
Dec 15, 2025
Updated
Dec 15, 2025
Vendor
Webutler
Product
Webutler
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 15, 2025Record 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=3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Webutler · Webutlerversion=3.2

Published CVSS scores

8.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.2NVDCVSS:3.1/AV:N/AC:L/PR:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

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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