What’s Vulnerable › Vulnerabilities

CVE-2021-47958: CouchCMS 2.2.1 Server-Side Request Forgery via SVG upload

• Severity: medium (CVSS 4.3 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: 2026-05-15 · updated 2026-06-17
• Weakness: CWE-918

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

• CouchCMS: 2.2.1

References

• https://github.com/CouchCMS/CouchCMS
• https://www.exploit-db.com/exploits/49675
• https://www.vulncheck.com/advisories/couchcms-server-side-request-forgery-via-svg-upload

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