Vulnerability · Published Feb 1, 2026 · Assigned by VulnCheck
CVE-2021-47917Simple CMS 2.1 Persistent Cross-Site Scripting via User Input Parameters
Medium 6.4
In plain English
A medium-severity cross-site scripting in Simple CMS from Simplephpscripts. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.3%top 73.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Simple CMS 2.1 contains a persistent cross-site scripting vulnerability in user input parameters that allows remote attackers to inject malicious script code. Attackers can exploit the newUser and editUser modules to inject persistent scripts that execute on user list preview, potentially leading to session hijacking and application manipulation.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Simplephpscripts | Simple CMS | 2.1 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
References
- Vulnerability Lab Advisory exploit
- Product Homepage product
- VulnCheck Advisory: Simple CMS 2.1 Persistent Cross-Site Scripting via User Input Parameters third-party-advisory