CVE-2021-43140

published 2021-11-03

CVE-2021-43140: SQL Injection vulnerability exists in Sourcecodester. Simple Subscription Website 1.0. via the login.

Priority P2 63 critical 9.8 CVSS 3.1

AV N AC L PR N UI N S U C H I H A H

EXPLOIT

SQL Injection vulnerability exists in Sourcecodester. Simple Subscription Website 1.0. via the login.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
oretnom23	simple_subscription_website	—	—

Detection & IOCs extracted from sources · hover to see the quote

url /plan_application/Actions.php?a=login↗

path /plan_application/admin/login.php↗

command admin' or 1=1-- -↗

command username=admin'+or+1%3D1--+-&password=admin'+or+1%3D1--+-↗

• → Detect POST requests targeting the vulnerable login endpoint /plan_application/Actions.php with query parameter a=login, which is the specific attack surface for CVE-2021-43140. ↗
• → Inspect POST body for SQLi authentication bypass patterns in both username and password fields, specifically the classic OR-based tautology with comment terminator (e.g., ' or 1=1-- -). ↗
• → Flag requests to /plan_application/Actions.php where the Content-Type is application/x-www-form-urlencoded and X-Requested-With is XMLHttpRequest, matching the exploit's delivery mechanism. ↗
• → Alert on URL-encoded SQL comment sequences (%2D%2D+%2D or --+-) appearing in POST body parameters destined for login endpoints under /plan_application/. ↗

• · The exploit was tested only on Windows with XAMPP; behavior on other server stacks (Linux/Apache/MySQL) may differ, and the vulnerable path /plan_application/ may vary depending on deployment configuration. ↗

CVSS provenance

nvd v3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.5 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P

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