CVE-2021-47733 | THREATINT

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.

PUBLISHED Reserved 2025-12-23 | Published 2025-12-23 | Updated 2025-12-26 | Assigner VulnCheck

MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

MEDIUM: 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

<=5.4

affected

Credits

heinjame finder

References

www.exploit-db.com/exploits/50612 (ExploitDB-50612) exploit

www.cmsimple.org/en/ (CMSimple Official Homepage) product

www.vulncheck.com/...ite-scripting-via-html-unicode-encoding (VulnCheck Advisory: CMSimple 5.4 Cross-Site Scripting via HTML Unicode Encoding) third-party-advisory

cve.org (CVE-2021-47733)

nvd.nist.gov (CVE-2021-47733)

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