CVE-2021-40940 is a critical unrestricted file upload vulnerability affecting Monstra CMS version 3.0.4. This flaw allows attackers to upload arbitrary files, including malicious PHP scripts, due to insufficient filtering of file extensions. With a CVSS score of 9.8, it presents a severe risk, enabling complete compromise of confidentiality, integrity, and availability without requiring authentication or user interaction. Despite its critical severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 3.0.4CPE matchmatch criteria | cpe:2.3:a:monstra:monstra:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.