CVE-2021-42669

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 23.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-11-05 · updated 2026-06-17
Weakness: CWE-434

Description

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.

Affected products

SourceCodester Engineers Online Portal: all versions

References

https://github.com/TheHackingRabbi/CVE-2021-42669
https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671
https://www.sourcecodester.com/php/13115/engineers-online-portal-php.html
https://github.com/TheHackingRabbi/CVE-2021-42669
https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671
https://www.sourcecodester.com/php/13115/engineers-online-portal-php.html

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