Server-Side Request Forgery Vulnerability in CouchCMS by CouchCMS
CVE-2021-47958

5.3MEDIUM

Key Information:

Vendor

Couchcms

Status
Couchcms
Vendor
CVE Published:
15 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47958?

CouchCMS 2.2.1 contains a vulnerability that enables authenticated attackers to exploit server-side request forgery through the malicious upload of SVG files. By leveraging the browse.php endpoint, attackers can upload SVG files that include external entity references, allowing unauthorized HTTP requests to internal services and sensitive resources. This can lead to significant security implications if exploited.

Affected Version(s)

CouchCMS 2.2.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47958 - Proof of Concept

References

https://www.exploit-db.com/exploits/49675
exploit
https://github.com/CouchCMS/CouchCMS
product
https://www.vulncheck.com/advisories/couchcms-server-side...
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

xxcdd
.