CVE-2021-42669

A file upload vulnerability exists in Sourcecodester Engineers Online Portal in PHP via dashboard_teacher.php, which allows changing the avatar through teacher_avatar.php. Once an avatar gets uploaded it is getting uploaded to the /admin/uploads/ directory, and is accessible by all users. By uploading a php webshell containing "<?php system($_GET["cmd"]); ?>" the attacker can execute commands on the web server with - /admin/uploads/php-webshell?cmd=id.

• CWE-434

• https://github.com/TheHackingRabbi/CVE-2021-42669Exploit, Third Party Advisory
• https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671Exploit, Third Party Advisory
• https://www.sourcecodester.com/php/13115/engineers-online-portal-php.htmlProduct, Third Party Advisory
• https://github.com/TheHackingRabbi/CVE-2021-42669Exploit, Third Party Advisory
• https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671Exploit, Third Party Advisory
• https://www.sourcecodester.com/php/13115/engineers-online-portal-php.htmlProduct, Third Party Advisory

Published

Nov 5, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-42663An HTML injection vulnerability exists in Sourcecodester Onl…4.3
• CVE-2021-42664A Stored Cross Site Scripting (XSS) Vulneraibiilty exists in…5.4
• CVE-2021-42665An SQL Injection vulnerability exists in Sourcecodester Engi…9.8
• CVE-2021-42666A SQL Injection vulnerability exists in Sourcecodester Engin…8.8
• CVE-2021-42667A SQL Injection vulnerability exists in Sourcecodester Onlin…9.8
• CVE-2021-42668A SQL Injection vulnerability exists in Sourcecodester Engin…9.8
• CVE-2021-4267A vulnerability classified as problematic was found in tad_d…6.1
• CVE-2021-42670A SQL injection vulnerability exists in Sourcecodester Engin…9.8
• CVE-2021-42671An incorrect access control vulnerability exists in Sourceco…7.5
• CVE-2021-42675Kreado Kreasfero 1.5 does not properly sanitize uploaded fil…9.8
• CVE-2021-4268A vulnerability, which was classified as problematic, was fo…8.8
• CVE-2021-42681A Buffer Overflow vulnerability exists in Accops HyWorks DVM…8.8