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Vulnerability record · CVE-2021-42669 · published 5 November 2021

CVE-2021-42669: Engineers online portal project engineers online portal unrestricted file upload vulnerability

EEngineers Online Portal Project · Engineers Online Portal

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.

9.8 CVSS 3.1 Critical EPSS 23% · top 2.3% CWE-434 · Unrestricted file upload
9.8CVSS 3.1 base score, v2 10.0
23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-42669), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.