CVE-2021-40353

CRITICAL

openSIS 8.0 - SQL Injection via index.php USERNAME Parameter

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-40353. PoCs published by 5qu1n7.

AI-analyzed exploit summary This repository contains a writeup detailing a SQL injection vulnerability in openSIS 8.0 via the USERNAME parameter in index.php. It includes error-based and time-based injection examples, along with sqlmap output confirming exploitability.

Description

A SQL injection vulnerability exists in version 8.0 of openSIS when MySQL or MariaDB is used as the application database. An attacker can then issue the SQL command through the index.php USERNAME parameter. NOTE: this issue may exist because of an incomplete fix for CVE-2020-6637.

Exploits (1)

nomisec WRITEUP 5 stars
by 5qu1n7 · poc
https://github.com/5qu1n7/CVE-2021-40353

This repository contains a writeup detailing a SQL injection vulnerability in openSIS 8.0 via the USERNAME parameter in index.php. It includes error-based and time-based injection examples, along with sqlmap output confirming exploitability.

Classification
Writeup 90%
Attack Type
Sqli
Complexity
Trivial
Reliability
Reliable
Target: openSIS 8.0
No auth needed
Prerequisites: Access to the login page of openSIS 8.0 · MySQL or MariaDB as the backend database
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Product x_refsource_misc
https://www.opensis.com/download/english
Exploit, Third Party Advisory x_refsource_misc
https://github.com/5qu1n7/CVE-2021-40353

Scores

CVSS v3 9.8
EPSS 0.0283
EPSS Percentile 84.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-89
Status published
Products (1)
os4ed/opensis 8.0
Published Sep 01, 2021
Tracked Since Feb 18, 2026