SQL Injection in Task Management AdminLogin

Overview

CVE-2026-19343 is a classic, unauthenticated SQL injection vulnerability present in the AdminLogin.php endpoint of the code-projects Task Management System version 1.0. The flaw resides in the application’s failure to sanitize or parameterize user-supplied input — specifically the email and password POST parameters — before incorporating them into a database query. Because this endpoint is the administrative login gateway, exploitation requires no prior credentials, making this an externally reachable, pre-authentication attack surface with significant consequences.

The vulnerability was discovered and publicly disclosed by security researchers who published a working proof-of-concept, meaning active exploitation is a realistic concern for any internet-facing deployment of this application. The public availability of exploit code substantially lowers the barrier to attack, moving this beyond a theoretical risk.

Task Management System 1.0 is a PHP/MySQL web application targeting small teams and academic project deployments. While it may not be a large-scale enterprise product, instances are frequently deployed on shared hosting or exposed directly to the internet, compounding the risk surface for organizations or individuals who have adopted it.

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Technical Analysis

The root cause of CVE-2026-19343 is the direct interpolation of HTTP request parameters into a SQL query string without the use of prepared statements, parameterized queries, or even rudimentary escaping. The login handler in /admin/AdminLogin.php constructs its authentication query something like the following:

<?php
// VULNERABLE CODE — illustrative of the pattern in AdminLogin.php
include('db.php');

$email    = $_POST['email'];
$password = $_POST['password'];

$query  = "SELECT * FROM admin WHERE email='" . $email . "' AND password='" . $password . "'";
$result = mysqli_query($conn, $query);
$row    = mysqli_fetch_array($result);

if ($row) {
    $_SESSION['admin'] = $row['id'];
    header("Location: dashboard.php");
} else {
    echo "Invalid credentials.";
}
?>

An attacker submitting the value ' OR '1'='1' -- in the email field causes the composed query to become:

SELECT * FROM admin WHERE email='' OR '1'='1' -- ' AND password='anything'

The -- sequence comments out the remainder of the query, the OR '1'='1' tautology always evaluates to true, and the application authenticates the attacker as the first admin user in the result set — with no knowledge of valid credentials whatsoever.

Beyond authentication bypass, the same injection point is exploitable for more destructive techniques. A UNION-based or error-based injection payload can be used to enumerate the database schema, extract all table contents, and, depending on database user privileges, interact with the filesystem via LOAD_FILE() or INTO OUTFILE. The attack vector is network-accessible, requires no authentication, and imposes low complexity on the attacker — characteristics that align with the assigned CVSS 7.3 HIGH rating.

The underlying CWE classification is CWE-89: Improper Neutralization of Special Elements used in an SQL Command (‘SQL Injection’), one of the most persistently exploited vulnerability classes in web applications despite decades of well-documented mitigations.

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Impact

Successful exploitation of this vulnerability grants an attacker full administrative access to the Task Management System without valid credentials. From the administrative panel, an attacker can:

• Read all application data — tasks, user records, project assignments, notes, and any personally identifiable information stored in the database.
• Modify or delete data — alter task records, reassign ownership, or wipe the database entirely.
• Extract credential hashes — if admin passwords are stored as hashes, they can be extracted and cracked offline. If passwords are stored in plaintext (a common secondary failing in applications of this maturity level), they are directly exposed.
• Pivot via database privileges — if the MySQL user running the application has FILE privilege, the attacker may read sensitive server-side files or write web shells, escalating from database compromise to full server compromise.
• Conduct further attacks — harvested credentials, email addresses, and internal data can be used in phishing, credential stuffing against external services, or sold.

The CVSS 7.3 score reflects a network-accessible, low-complexity, no-privilege-required attack with high confidentiality and integrity impact. The absence of a required authentication step is the most operationally significant factor: this is exploitable by automated scanning tools and unsophisticated attackers alike.

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How to Fix It

The definitive remediation is to replace string-concatenated queries with prepared statements using parameterized inputs. This eliminates the injection vector at the database driver level, regardless of what characters the user submits.

<?php
// FIXED CODE — prepared statement with bound parameters
include('db.php');

$email    = $_POST['email'];
$password = $_POST['password'];

$stmt = $conn->prepare("SELECT id, password_hash FROM admin WHERE email = ?");
$stmt->bind_param("s", $email);
$stmt->execute();
$result = $stmt->get_result();
$row    = $result->fetch_assoc();
$stmt->close();

if ($row && password_verify($password, $row['password_hash'])) {
    $_SESSION['admin'] = $row['id'];
    header("Location: dashboard.php");
    exit;
} else {
    echo "Invalid credentials.";
}
?>

Key changes demonstrated above:

1. Parameterized query — the ? placeholder is bound via bind_param(). The database driver handles escaping at the protocol level; user input can never alter query structure.
2. Secure password verification — passwords should be stored as bcrypt hashes using password_hash() and verified with password_verify(), never compared as plaintext or unsalted MD5/SHA1.
3. Explicit exit after redirect — prevents logic continuation after header() calls, closing a secondary control-flow bypass.

Additional hardening measures:

• Apply the principle of least privilege to the database user: the application account should have only SELECT, INSERT, UPDATE, and DELETE on its own schema — never FILE, SUPER, or global privileges.
• Implement rate limiting and account lockout on the admin login endpoint to mitigate brute-force attacks even if injection is closed.
• Enable Web Application Firewall (WAF) rules targeting SQL injection patterns as a defense-in-depth layer, not a substitute for code-level fixes.
• Audit all other endpoints in the application for the same pattern — SQLi in a login page is frequently symptomatic of a systemic coding practice applied throughout the codebase.

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Our Take

SQL injection in an authentication endpoint is not a subtle or nuanced vulnerability — it is a fundamental failure of input validation that has been understood, documented, and mitigated for well over two decades. The persistence of CWE-89 in modern codebases, including in purpose-built application templates like this one, reflects a gap between security awareness and actual development practice. Academic and portfolio projects frequently bypass security review entirely, but when those projects are deployed to production or adopted by small organizations, they carry real operational risk.

For enterprises, the concern extends beyond this specific CVE. Applications sourced from open repositories — project templates, starter kits, educational codebases — are often adopted without security vetting. A single vulnerable dependency or forked codebase can introduce pre-authentication remote code execution paths into an otherwise hardened environment. DAST coverage of all web-facing login endpoints, combined with SAST scanning during the build pipeline, is the minimum viable security posture for catching vulnerabilities of this class before they reach production.

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Detection with SAST

SAST tools detect SQL injection by modeling data flow from source (untrusted input, e.g., $_POST, $_GET, $_REQUEST) to sink (dangerous function, e.g., mysqli_query(), mysql_query(), PDO::query()) and flagging any path where tainted data reaches a sink without passing through a recognized sanitization or parameterization function.

Offensive360’s SAST engine flags this pattern under CWE-89 and maps it to the OWASP Top 10 A03:2021 – Injection category. Specific rule triggers include:

• Direct string concatenation of $_POST or $_GET variables into SQL query strings.
• Use of mysqli_query() or equivalent with a dynamically composed query string rather than a prepared statement handle.
• Absence of mysqli_real_escape_string(), PDO::prepare(), or equivalent neutralization on the tainted variable before sink consumption.

The confidence level for this specific pattern (unsanitized $_POST directly concatenated into a mysqli_query() call) is HIGH with a very low false-positive rate, making it an ideal candidate for blocking pipeline gates rather than advisory-only reporting.

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References

• https://github.com/littleRain1355/PHPissue/issues/2
• https://code-projects.org/
• https://vuldb.com/cve/CVE-2026-19343
• https://vuldb.com/submit/865355
• https://vuldb.com/vuln/387179
• https://vuldb.com/vuln/387179/cti