Persistent Cross-Site Scripting in Composr CMS Affects Administrators
CVE-2020-37237

5.1MEDIUM

Key Information:

Vendor

Compo

Status
Composr Cms
Vendor
CVE Published:
16 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-37237?

Composr CMS 10.0.34 is susceptible to a persistent cross-site scripting vulnerability that enables authenticated administrators to inject malicious scripts via the banner management interface. Attackers with admin access can manipulate the Description field when adding banners, resulting in the execution of malicious XSS payloads for all visitors to the home page, potentially compromising user security and data integrity.

Affected Version(s)

Composr CMS 10.0.34

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-2020-37237 - Proof of Concept

References

https://www.exploit-db.com/exploits/49190
exploit
https://compo.sr/
product
https://compo.sr/download.htm
product

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

Parshwa Bhavsar
.