CVE-2021-47733

5.1 mediumEPSS 0.3%

Medium (5.1) in cmsimple cmsimple. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 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

CVSS 3.1

6.1 medium

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2025-12-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

cmsimple:cmsimple

References

https://www.cmsimple.org/en/
https://www.exploit-db.com/exploits/50612
https://www.vulncheck.com/advisories/cmsimple-cross-site-scripting-via-html-unicode-encoding

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