CVE-2021-47736

CMSimple_XH 1.7.4 Authenticated Remote Code Execution via Content Editing

CMSimple_XH 1.7.4 contains an authenticated remote code execution vulnerability in the content editing functionality that allows administrative users to upload malicious PHP files. Attackers with valid credentials can exploit the CSRF token mechanism to create a PHP shell file that enables arbitrary command execution on the server.

Affected

Cmsimple-Xh · CMSimple_XH

CVSS v4.0 VULNCHECK

8.6 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/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:X/V:X/RE:X/U:X

CVSS v3.1 NVD

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

EPSS

1.08% chance of exploitation in the next 30 days, 64th percentile

Published

2025-12-23

Updated

2026-07-15

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/50367

Security advisories

• https://www.vulncheck.com/advisories/cmsimplexh-authenticated-remote-code-execution-via-c…
• https://www.cmsimple-xh.org

References

• CVE Record
• NVD entry