What is CVE-2021-47958?

CVE-2021-47958 is a medium-severity vulnerability in Couchcms, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-05-15.

How severe is CVE-2021-47958?

Medium severity. CVSS v3 base score is 4.3 out of 10.

SSRF in Couchcms

CVE-2021-47958

CouchCMS 2.2.1 contains a server-side request forgery vulnerability that allows authenticated attackers to make arbitrary HTTP requests by uploading malicious SVG files. Attackers can upload SVG files containing external entity references…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (8.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Couchcms — versions 2.2.1

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

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

Frequently asked questions

What is CVE-2021-47958?: CVE-2021-47958 is a medium-severity vulnerability in Couchcms, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-05-15.
How severe is CVE-2021-47958?: Medium severity. CVSS v3 base score is 4.3 out of 10.