Vulnerability · Published May 16, 2026 · Assigned by VulnCheck
CVE-2021-47955CouchCMS 2.2.1 Cross-Site Scripting via SVG File Upload
Medium 5.4
In plain English
A medium-severity cross-site scripting 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 7% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 93.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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 containing embedded script tags to the browse.php endpoint, which are then executed in users' browsers when the files are accessed or previewed.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- ExploitDB-49636 exploit
- Official Product Homepage product
- VulnCheck Advisory: CouchCMS 2.2.1 Cross-Site Scripting via SVG File Upload third-party-advisory