What is CVE-2021-47955?

CVE-2021-47955 is a medium-severity vulnerability in Couchcms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-16.

How severe is CVE-2021-47955?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Couchcms

CVE-2021-47955

CouchCMS 2.2.1 contains a cross-site scripting vulnerability that allows authenticated attackers to execute arbitrary JavaScript by uploading malicious SVG files through the file upload functionality. Attackers can upload SVG files contain…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (8.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Couchcms — versions 2.2.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2021-47955?: CVE-2021-47955 is a medium-severity vulnerability in Couchcms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-16.
How severe is CVE-2021-47955?: Medium severity. CVSS v3 base score is 5.4 out of 10.