Authenticated File Upload Vulnerability in PhreeBooks by PhreeSoft
CVE-2021-47904

8.7HIGH

Key Information:

Vendor

Phreesoft

Status
Phreebooks
Vendor
CVE Published:
23 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47904?

PhreeBooks version 5.2.3 is susceptible to an authenticated file upload vulnerability in its Image Manager component. This flaw enables malicious actors to upload unauthorized files, such as a PHP web shell, which can lead to remote code execution on the affected server. By exploiting unrestricted file type uploads, attackers can gain command execution, potentially compromising the integrity and confidentiality of the server's data.

Affected Version(s)

PhreeBooks 5.2.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47904 - Proof of Concept

CVE-2021-47904 - Proof of Concept

References

https://www.exploit-db.com/exploits/49524
exploit
https://www.phreesoft.com/
product
https://www.exploit-db.com/exploits/46645
exploit

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kr0ff
JSON
.