{"cve":"CVE-2021-42669","nvd":{"published":"2021-11-05T13:15:09.213","modified":"2026-06-17T04:09:56.570","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-434"],"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"],"products":["engineers_online_portal_project:engineers_online_portal"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-42669","score":0.2327,"percentile":0.97777,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}