SQL Injection in Class Timetabling System Parameter Handling

A vulnerability was identified in SourceCodester Class and Exam Timetabling System 1.0/5.php. Affected by this vulnerability is an unknown functionality of the file /preview5.php. Such manipulation of the argument course_year_section leads to sql injection. The attack may be performed from remote. The exploit is publicly available and might be used.

Casky was already ahead

This CVE exploits attack patterns that Casky's 322matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-13521 exposes a critical SQL injection vulnerability in SourceCodester's Class and Exam Timetabling System version 1.0, specifically within the /preview5.php file's course_year_section parameter. This remotely exploitable flaw allows attackers to manipulate database queries without authentication, potentially leading to unauthorized data access, modification, or deletion of academic records, student information, and institutional data. Educational institutions, training centers, and any organization using this timetabling system face immediate risk, particularly as the exploit is publicly available and could be weaponized for data exfiltration or system compromise.

Casky's 322 mapped security skills leverage Claude's extended reasoning to detect the attack patterns behind this vulnerability across MITRE ATT&CK techniques TA0001 (Reconnaissance) and TA0043 (Reconnaissance). Practitioners using Casky would identify suspicious activity through skill detections targeting CWE-74 (Improper Neutralization of Special Elements in Output) and CWE-89 (SQL Injection) patterns—specifically monitoring for SQL metacharacters in the course_year_section parameter, unusual database query structures, time-based or error-based SQL inference attempts, and abnormal database connection patterns. When practitioners review their findings, they'll see Claude's reasoning correlate input validation failures with database interaction anomalies, flagging reconnaissance activities where attackers probe parameter boundaries and construction of malformed SQL statements before execution, enabling early intervention before data exfiltration occurs.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

322 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-13521.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

Investigate the attack patterns behind CVE-2026-13521

Casky has 322 skills that investigate the attack patterns behind CVE-2026-13521. Run one and get CVSS-scored findings in 3 minutes.

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