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Vulnerability record · CVE-2021-47904 · published 23 January 2026

CVE-2021-47904: Unrestricted file upload vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.70% · top 48.8% CWE-434 · Unrestricted file upload Deferred
8.7CVSS 4.0 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://gist.github.com/joswr1ght/22f40787de19d80d110b37fb79ac3985
https://www.exploit-db.com/exploits/46645
https://www.exploit-db.com/exploits/49524
https://www.phreesoft.com/
https://www.vulncheck.com/advisories/phreebooks-remote-code-execution
https://www.exploit-db.com/exploits/49524

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Source: NIST National Vulnerability Database (record CVE-2021-47904), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.