Vulnerability · Published May 15, 2026 · Assigned by VulnCheck
CVE-2021-47958CouchCMS 2.2.1 Server-Side Request Forgery via SVG upload
Medium 4.3
In plain English
A medium-severity server-side request forgery in CouchCMS from CouchCMS. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.2%top 85.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- ExploitDB-49675 exploit
- Official Product Homepage product
- VulnCheck Advisory: CouchCMS 2.2.1 Server-Side Request Forgery via SVG upload third-party-advisory