Arbitrary file upload in Phreesoft Phreebooks
CVE-2021-47904
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.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.001
Affected products
- Phreesoft Phreebooks — versions 5.2.3
Weakness classification (CWE)
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)
Frequently asked questions
- What is CVE-2021-47904?
- CVE-2021-47904 is a high-severity vulnerability in Phreesoft Phreebooks, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-01-23.
- How severe is CVE-2021-47904?
- High severity. CVSS v3 base score is 8.8 out of 10.