Simple CMS 2.1 Persistent Cross-Site Scripting via User Input Parameters
Priority MEDIUM 56CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00329 26th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SimplePHPscripts | Simple CMS | 2.1 | — | No fix listed | CNA |
- Simple CMS VendorSimplePHPscripts Affected 2.1 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:simplephpscripts:simple_cms_php:2.1:*:*:*:*:*:*:* | 2.1 | Vulnerable | SimplePHPscripts |
- cpe:2.3:a:simplephpscripts:simple_cms_php:2.1:*:*:*:*:*:*:* Versions 2.1 Vulnerable ·SimplePHPscripts
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-47917
- 2026-10-03 Alias added: GHSA-pgc8-g7q5-fq5m
References
Exploit 1
Other 1
More SimplePHPscripts Simple Cms Php vulnerabilities
- TI-2021-22531 Simple CMS 2.1 SQL Injection Vulnerability via Users Module CVSS 4.0HIGH 8.6
- TI-2021-22532 Simple CMS 2.1 Non-Persistent Cross-Site Scripting via Preview Parameter CVSS 4.0MEDIUM 5.1
Sources
- CVE-2021-47917 · CVE Program
- CVE-2021-47917 · NVD
- FIRST EPSS
- GHSA-pgc8-g7q5-fq5m · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences