PT-2025-52835 · Cmsimple · Cmsimple

Pussycat0X · Published 2025-12-23 · Updated 2025-12-23 · CVE-2021-47735

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions CMSimple version 5.4

Description The software contains an authenticated remote code execution issue 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. The vulnerable functionality involves the ability to modify template files. The API endpoint used for template editing requires a valid CSRF token. The vulnerable parameter is the content of the template file being edited.

Recommendations Update to a newer version that contains a fix for this vulnerability. As a temporary workaround, restrict access to the template editing functionality. Ensure valid CSRF tokens are implemented and verified for all template editing requests.

Exploit

Fix

RCE

Code Injection

Weakness Enumeration

CWE-94

Related Identifiers

CVE-2021-47735

Affected Products

Cmsimple

References · 7

• 🔥 https://exploit-db.com/exploits/50356 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-47735 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47735 · Vendor Advisory
• https://cmsimple.org · Note
• https://twitter.com/CveFindCom/status/2003566106015945009 · Twitter Post
• https://vulncheck.com/advisories/cmsimple-authenticated-remote-code-execution-via-template-editing · Note
• https://twitter.com/CVEnew/status/2003567285043138763 · Twitter Post