CVE-2020-5842

MEDIUM

Codoforum 4.8.3 - Stored Cross-Site Scripting via User Registration Username Field

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2020-5842. PoCs published by Prasanth, prasanthc41m.

AI-analyzed exploit summary This exploit demonstrates a stored XSS vulnerability in Codoforum 4.8.3 by injecting malicious JavaScript into the username field during user registration, which triggers when an admin views the user management page.

Description

Codoforum 4.8.3 allows XSS in the user registration page: via the username field to the index.php?u=/user/register URI. The payload is, for example, executed on the admin/index.php?page=users/manage page.

Exploits (2)

exploitdb WORKING POC
by Prasanth · textwebappsphp
https://www.exploit-db.com/exploits/47876

This exploit demonstrates a stored XSS vulnerability in Codoforum 4.8.3 by injecting malicious JavaScript into the username field during user registration, which triggers when an admin views the user management page.

Classification
Working Poc 95%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Codoforum 4.8.3
No auth needed
Prerequisites: Access to user registration page · Admin interaction with user management page
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WRITEUP 1 stars
by prasanthc41m · poc
https://github.com/prasanthc41m/codoforum

This repository provides a detailed technical writeup of CVE-2020-5842, a stored XSS vulnerability in Codoforum 4.8.3. It includes step-by-step recreation instructions, affected components, and mitigation strategies.

Classification
Writeup 95%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Codoforum 4.8.3
No auth needed
Prerequisites: Access to the user registration page
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/47876

Scores

CVSS v3 6.1
EPSS 0.0182
EPSS Percentile 75.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
codologic/codoforum 4.8.3
Published Jan 07, 2020
Tracked Since Feb 18, 2026