What’s Vulnerable › Vulnerabilities

CVE-2021-47955: CouchCMS 2.2.1 Cross-Site Scripting via SVG File Upload

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-16 · updated 2026-06-17
• Weakness: CWE-79

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

• CouchCMS: 2.2.1

References

• https://github.com/CouchCMS/CouchCMS
• https://www.exploit-db.com/exploits/49636
• https://www.vulncheck.com/advisories/couchcms-cross-site-scripting-via-svg-file-upload

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