CVE-2021-47904Public exploitNetwork attack vector

Authenticated code execution via unrestricted PHP upload

Published Jan 23, 2026 · Updated Jan 23, 2026

Unrestricted file upload in PhreeBooks ERP 5.2.3 allows remote authenticated users to execute server-side PHP through Image Manager. The bizuno/image/manager upload action accepts the imgFile part without file-extension controls and stores it under the web-accessible myFiles/images path. Valid application credentials are sufficient, and requesting the uploaded PHP file executes commands with the web server process privileges.

CVSS severity8.7
High
EPSS probability0.64%
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 PhreeBooks ERP 5.2.3 allows remote authenticated users to execute server-side PHP through Image Manager. The bizuno/image/manager upload action accepts the imgFile part without file-extension controls and stores it under the web-accessible myFiles/images path. Valid application credentials are sufficient, and requesting the uploaded PHP file executes commands with the web server process privileges.

The record

CVE
CVE-2021-47904
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
PhreeSoft
Product
PhreeBooks ERP
Classifications
CWE-434, CAPEC-1, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 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=5.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PhreeSoft · PhreeBooks ERPversion=5.2.3

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

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
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1190Exploit Public-Facing Application

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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