What is CVE-2021-47734?

CVE-2021-47734 is a high-severity vulnerability in Cmsimple, classified under PHP Remote File Inclusion. CVSS score: 7.8/10. Published 2025-12-23.

How severe is CVE-2021-47734?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Cmsimple

CVE-2021-47734

CMSimple 5.4 contains an authenticated local file inclusion vulnerability that allows remote attackers to manipulate PHP session files and execute arbitrary code. Attackers can leverage the vulnerability by changing the functions file path and uploading malicious PHP code through session file upload mechanisms.

EPSS: 0.007 (50.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cmsimple — versions 5.4, CMSimple 5.4

Weakness classification (CWE)

CWE-98 — PHP Remote File Inclusion

References

disclosure@vulncheck.com (Exploit, exploit)
disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2021-47734?: CVE-2021-47734 is a high-severity vulnerability in Cmsimple, classified under PHP Remote File Inclusion. CVSS score: 7.8/10. Published 2025-12-23.
How severe is CVE-2021-47734?: High severity. CVSS v3 base score is 7.8 out of 10.