CVE-2026-90849: College Notes Gallery System SQL Injection

CVE-2026-90849 Overview

CVE-2026-90849 is a SQL injection vulnerability in SourceCodester College Notes Gallery Management System 1.0. The flaw resides in the /College/login.php endpoint, where the User parameter is passed to a backend database query without proper sanitization. Attackers can inject crafted SQL payloads remotely without authentication or user interaction. The exploit has been publicly disclosed, increasing the likelihood of opportunistic scanning and abuse against exposed instances. The weakness is categorized under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).

Critical Impact
Unauthenticated remote attackers can manipulate SQL statements through the login form, potentially leading to authentication bypass, credential disclosure, or unauthorized data access.

Affected Products

SourceCodester College Notes Gallery Management System 1.0
Affected file: /College/login.php
Affected parameter: User

Discovery Timeline

2026-09-15 - CVE-2026-90849 published to the National Vulnerability Database (NVD)
2026-09-15 - Last updated in NVD database

Technical Details for CVE-2026-90849

Vulnerability Analysis

The vulnerability is a classic SQL injection flaw in the authentication workflow of the College Notes Gallery Management System. The login.php script accepts the User parameter from client input and concatenates it into a SQL query executed against the backend database. Because no parameterized queries or input validation are applied, an attacker can break out of the intended string context and append arbitrary SQL clauses. Successful exploitation may allow attackers to bypass authentication, enumerate database contents, or extract stored user credentials from the application.

Root Cause

The root cause is the lack of prepared statements and input neutralization when constructing the login query. User-controlled data flows directly into the database engine, allowing the query grammar to be altered by attacker-supplied characters such as single quotes, comments, and boolean operators. This maps to [CWE-74], the broader class of injection weaknesses stemming from improper output neutralization for downstream components.

Attack Vector

The attack is delivered over the network against the exposed login page. No credentials or user interaction are required, and the exploit can be triggered by a single crafted HTTP POST request to /College/login.php. Public disclosure of proof-of-concept details on the GitHub Issue Report and VulDB CVE-2026-90849 lowers the barrier for exploitation by opportunistic actors scanning for vulnerable SourceCodester deployments.

A technical description of the injection point is available in the referenced advisories. No verified exploit code is reproduced here; see the VulDB Vulnerability #403404 entry for further technical context.

Detection Methods for CVE-2026-90849

Indicators of Compromise

HTTP POST requests to /College/login.php containing SQL metacharacters such as ', --, UNION, OR 1=1, or SLEEP( in the User parameter.
Web server or application logs showing repeated failed login attempts followed by successful authentication from the same source IP.
Database error messages returned in HTTP responses referencing MySQL syntax errors originating from the login query.
Unexpected outbound queries or data reads from the application database account tied to login activity.

Detection Strategies

Deploy web application firewall (WAF) signatures that inspect POST bodies to login.php for SQL injection patterns targeting the User field.
Enable database query logging and alert on unusually long or malformed queries originating from the application user account.
Correlate authentication events with source IP reputation to surface automated exploitation attempts against exposed instances.

Monitoring Recommendations

Monitor web server access logs for anomalous request lengths and encoded payloads targeting /College/login.php.
Alert on database engine warnings, syntax errors, or UNION-based response patterns generated by the login workflow.
Track egress data volumes from application database servers to identify potential bulk exfiltration following injection.

How to Mitigate CVE-2026-90849

Immediate Actions Required

Restrict network exposure of the College Notes Gallery Management System by placing it behind a VPN or IP allowlist until a fix is deployed.
Deploy WAF rules that block SQL injection payloads targeting the User parameter of /College/login.php.
Rotate database and application credentials if exploitation is suspected, and audit user tables for unauthorized modifications.

Patch Information

No official vendor patch has been referenced in the NVD entry for CVE-2026-90849. Administrators should monitor SourceCodester Security Articles and the VulDB CVE-2026-90849 advisory for update notices. Until an official fix is published, operators should apply source-level mitigations such as replacing string concatenation with parameterized queries in login.php.

Workarounds

Modify login.php to use prepared statements or parameterized queries via PDO or MySQLi with bound parameters.
Apply server-side input validation that rejects non-alphanumeric characters in the User field before database interaction.
Configure the application database account with least-privilege permissions to limit the impact of successful injection.
Enable verbose logging on the application and forward events to a centralized SIEM or data lake for detection and forensic review.

bash

# Example PHP mitigation using PDO prepared statements in login.php
$stmt = $pdo->prepare('SELECT id, password_hash FROM users WHERE username = :user');
$stmt->execute([':user' => $_POST['User']]);
$row = $stmt->fetch(PDO::FETCH_ASSOC);