What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-23 · updated 2026-06-17
• Weakness: CWE-94

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.

Affected products

• CMSimple: 5.4

References

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

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