CVE-2026-2247: Clicldeu SaaS SQL Injection Vulnerability

CVE-2026-2247 Overview

CVE-2026-2247 is a SQL Injection vulnerability affecting the Clickedu SaaS platform, specifically within the report generation functionality. The vulnerability exists in the mobile application's "Day-to-day" section, where an authenticated remote attacker can execute malicious SQL payloads through the URL generated when downloading student report cards.

The vulnerability is particularly concerning because the session tokens used in the generated PDF URLs do not expire, remaining valid for days after generation. This allows attackers to inject unusual characters after the id_alu parameter, enabling both boolean-based blind and time-based blind SQL injection attacks. Successful exploitation could allow unauthorized access to confidential information stored in the database.

Critical Impact

Authenticated attackers can exploit non-expiring session tokens to perform SQL injection attacks, potentially accessing sensitive student data and other confidential database information through the report generation feature.

Affected Products

• Clickedu SaaS Platform (Mobile Application)
• Clickedu Report Generation Module
• Clickedu "Day-to-day" Section Report Card Downloads

Discovery Timeline

• 2026-02-17 - CVE-2026-2247 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2026-2247

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) exists within the report generation component of the Clickedu SaaS platform. The core issue stems from improper input validation on the id_alu parameter used in URLs generated for downloading student report cards via the mobile application.

The vulnerability supports two exploitation techniques: boolean-based blind SQL injection and time-based blind SQL injection. Boolean-based blind attacks allow attackers to infer database content by observing different application responses based on true/false conditions. Time-based blind attacks enable data extraction by measuring response delays when the database processes sleep or delay commands.

The network-accessible attack vector combined with low attack complexity makes this vulnerability particularly accessible to malicious actors who have obtained valid authentication credentials.

Root Cause

The root cause of CVE-2026-2247 is improper input sanitization on the id_alu parameter within the report generation URL endpoint. The application fails to properly validate, escape, or parameterize user-supplied input before incorporating it into SQL queries.

Additionally, the session token management implementation is flawed—tokens embedded in report download URLs do not have proper expiration mechanisms. This allows attackers extended windows of opportunity to craft and execute SQL injection payloads against valid session contexts.

Attack Vector

The attack is executed remotely over the network by an authenticated user. The attacker must first obtain legitimate access to the Clickedu mobile application, then navigate to the "Day-to-day" section and initiate a student report card download.

Once the PDF download URL is generated, the attacker can manipulate the id_alu parameter by appending SQL injection payloads. Because the session token does not expire, the attacker has an extended timeframe to test various injection techniques and extract database information through boolean or time-based inference methods.

The attack flow involves intercepting the generated URL, modifying the vulnerable parameter with SQL injection payloads, and analyzing response behaviors (content differences or timing delays) to systematically extract database contents.

Detection Methods for CVE-2026-2247

Indicators of Compromise

• Unusual characters or SQL syntax (such as single quotes, semicolons, UNION, SELECT, SLEEP, WAITFOR) appearing in web server logs after the id_alu parameter
• Multiple sequential requests to report generation URLs with incrementally modified parameters
• Anomalous response timing patterns indicating time-based SQL injection probing
• Extended use of session tokens beyond normal operational timeframes

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in URL parameters
• Implement application-layer logging to capture all requests to the report generation endpoint with full parameter details
• Configure Security Information and Event Management (SIEM) alerts for patterns consistent with blind SQL injection techniques
• Monitor for abnormal database query execution times that may indicate time-based injection attempts

Monitoring Recommendations

• Enable detailed access logging on web servers handling the Clickedu mobile application backend
• Implement real-time alerting for requests containing common SQL injection keywords targeting the report generation functionality
• Track session token usage patterns to identify tokens being used beyond expected timeframes
• Conduct regular log analysis focusing on the id_alu parameter across all report download requests

How to Mitigate CVE-2026-2247

Immediate Actions Required

• Restrict access to the report generation functionality until a patch is applied
• Implement input validation and parameterized queries on the id_alu parameter at the application layer
• Configure session tokens to expire within a reasonable timeframe (minutes rather than days)
• Deploy WAF rules to block requests containing SQL injection patterns targeting report endpoints

Patch Information

Organizations using the Clickedu SaaS platform should consult the vendor directly for patch availability. For additional information regarding this vulnerability and official vendor guidance, refer to the INCIBE Security Notice on SQL Injection.

Since this is a SaaS platform, remediation is primarily the responsibility of the vendor. Organizations should confirm with Clickedu that the vulnerability has been addressed in the production environment.

Workarounds

• Implement web application firewall rules to filter malicious SQL injection patterns before they reach the application
• Consider temporarily disabling or restricting access to the report card download feature in the mobile application until remediation is confirmed
• Enable enhanced logging and monitoring to detect exploitation attempts while awaiting a vendor patch
• Educate users about the vulnerability and advise caution when generating or sharing report card download URLs

# Example WAF rule to block SQL injection in id_alu parameter
# This is a conceptual configuration - adapt to your specific WAF solution
SecRule ARGS:id_alu "@detectSQLi" \
    "id:100001,\
    phase:2,\
    block,\
    msg:'SQL Injection attempt detected in id_alu parameter',\
    log,\
    severity:'CRITICAL'"