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 through the browse.php endpoint to access internal services and resources.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (13.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Couchcms — versions 2.2.1
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49675 (exploit)
- github.com/CouchCMS/CouchCMS (product)
- www.vulncheck.com/advisories/couchcms-server-side-request-forgery-via-svg-upload (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.