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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.008 (54.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: -0.000
Affected products
- Cmsimple — versions 5.4, CMSimple 5.4
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/50547 (Exploit, exploit)
- www.cmsimple.org/en/ (Product, product)
- www.vulncheck.com/advisories/cmsimple-authenticated-local-file-inclusion-remote… (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.