High 8.8Published Dec 23, 2025

CVE-2021-47735CMSimple 5.4 Authenticated Remote Code Execution via Template Editing

Updated under an hour ago (Oct 26, 2026, 7:00 PM ET)

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Exploited in the last 30 days

CMSimple 5.4 contains an authenticated remote code execution vulnerability that allows logged-in attackers to inject malicious PHP code into template files. Attackers can exploit the template editing functionality by crafting a reverse shell payload and saving it through the template editing endpoint with a valid CSRF token.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-94
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Mar 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Cmsimple Cmsimple cmsimple:cmsimple (from the name)	5.4	CNA record
cmsimple cmsimple cmsimple:cmsimple	5.4	NVD

References

References

https://www.exploit-db.com/exploits/50356	exploit
https://www.cmsimple.org/	product
https://www.vulncheck.com/advisories/cmsimple-authenticated-remote-code-execution-via-template-editing	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.