Cross-Site Scripting Vulnerability in CouchCMS by CouchCMS
CVE-2021-47955

5.1MEDIUM

Key Information:

Vendor

Couchcms

Status
Couchcms
Vendor
CVE Published:
16 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47955?

CouchCMS version 2.2.1 features a vulnerability that allows authenticated attackers to exploit the file upload functionality. By uploading malicious SVG files containing embedded JavaScript, attackers can execute arbitrary scripts within users' browsers when the files are accessed or previewed. This flaw highlights the importance of validating and sanitizing file uploads to prevent such exploits.

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-2021-47955 - Proof of Concept

References

https://www.exploit-db.com/exploits/49636
exploit
https://github.com/CouchCMS/CouchCMS
product
https://www.vulncheck.com/advisories/couchcms-cross-site-...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

xxcdd
.