CVE-2021-47734

8.6 highEPSS 0.8%

High (8.6) in cmsimple cmsimple. EPSS 0.8% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.6 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.8 high

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-10-31)
CWE: CWE-98
Published: 2025-12-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

cmsimple:cmsimple

References

https://www.cmsimple.org/en/
https://www.exploit-db.com/exploits/50547
https://www.vulncheck.com/advisories/cmsimple-authenticated-local-file-inclusion-remote-code-execution

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