CVE-2021-47733

CMSimple 5.4 Cross-Site Scripting via HTML Unicode Encoding

Published Dec 23, 2025 CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:cmsimple:cmsimple:5.4:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Cmsimple
Cmsimple cmsimple
Vendors & Products Cmsimple
Cmsimple cmsimple
Type Values Removed Values Added
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.
Title CMSimple 5.4 Cross-Site Scripting via HTML Unicode Encoding
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.1, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Apr 7, 2026, 2:05 PM
Reserved
Dec 23, 2025, 1:24 PM
Status
Analyzed
Published
Dec 23, 2025, 8:15 PM
Modified
Jun 17, 2026, 4:18 AM