CVE-2021-47733
CMSimple 5.4 Cross-Site Scripting via HTML Unicode Encoding
- State
- Published
- Severity
- 5.1 Medium
- Published
- Dec 23, 2025
- Updated
- Apr 7, 2026
- Reserved
- Dec 23, 2025
Description
CMSimple 5.4 contains a cross-site scripting vulnerability that allows attackers to bypass input filtering by using HTML to Unicode encoding. Attackers can inject malicious scripts by encoding payloads like ')-alert(1)// and execute arbitrary JavaScript when victims interact with delete buttons.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
CMSimpleCmsimple |
|
References
- ExploitDB-50612exploit
- CMSimple Official Homepageproduct
- VulnCheck Advisory: CMSimple 5.4 Cross-Site Scripting via HTML Unicode Encodingthird-party-advisory
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