Vulnerability · Published Jan 23, 2026 · Assigned by VulnCheck
CVE-2021-47904PhreeBooks 5.2.3 - Remote Code Execution
High 8.8
In plain English
A high-severity unrestricted file upload in PhreeBooks from Phreesoft. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.7%top 46.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
PhreeBooks 5.2.3 contains an authenticated file upload vulnerability in the Image Manager that allows remote code execution. Attackers can upload a malicious PHP web shell by exploiting unrestricted file type uploads to gain command execution on the server.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Phreesoft | PhreeBooks | 5.2.3 |
Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- ExploitDB-49524 exploit
- Official Vendor Homepage product
- ExploitDB-46645 exploit
- Web Shell Payload Gist product
- VulnCheck Advisory: PhreeBooks 5.2.3 - Remote Code Execution third-party-advisory