High severity8.8NVD Advisory· Published Dec 23, 2025· Updated Jun 17, 2026

CVE-2021-47735

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cmsimple/Cmsimple3 versions
cpe:2.3:a:cmsimple:cmsimple:5.4:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:cmsimple:cmsimple:5.4:*:*:*:*:*:*:*
- (no CPE)range: <5.4
- (no CPE)range: 5.4

Patches

Vulnerability mechanics

References

www.exploit-db.com/exploits/50356nvdExploit
www.vulncheck.com/advisories/cmsimple-authenticated-remote-code-execution-via-template-editingnvdThird Party Advisory
www.cmsimple.orgnvdProduct

News mentions

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