CVE-2026-7741: Online Classroom 1.0 SQLi Vulnerability

CVE-2026-7741 Overview

CVE-2026-7741 is a SQL injection vulnerability in CodeAstro Online Classroom 1.0. The flaw resides in the /OnlineClassroom/studentlogin endpoint, where the sid parameter is passed to a database query without proper sanitization. Remote attackers with low-level privileges can manipulate the parameter to inject arbitrary SQL statements. The exploit has been disclosed publicly and may be reused by opportunistic attackers. The weakness is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component.

Critical Impact

Remote attackers can manipulate the sid parameter on the student login endpoint to execute arbitrary SQL queries against the application database, exposing student records and credentials.

Affected Products

• CodeAstro Online Classroom 1.0
• /OnlineClassroom/studentlogin endpoint
• Deployments exposing the affected web application to untrusted networks

Discovery Timeline

• 2026-05-04 - CVE-2026-7741 published to NVD
• 2026-05-04 - Last updated in NVD database

Technical Details for CVE-2026-7741

Vulnerability Analysis

The vulnerability exists in the student login workflow of CodeAstro Online Classroom 1.0. The studentlogin handler accepts the sid parameter from client requests and concatenates the value into a SQL query without parameterization or input validation. An authenticated attacker holding low-privilege credentials can submit crafted payloads to alter query logic, extract database contents, or bypass authentication checks.

Public disclosure of the technique increases the likelihood of automated scanning against exposed instances. Refer to the VulDB Vulnerability #360916 entry for additional context.

Root Cause

The root cause is improper neutralization of special characters supplied through the sid HTTP parameter. The application builds SQL statements by string concatenation rather than using prepared statements or parameter binding. Common SQL metacharacters such as single quotes, comments, and UNION keywords pass through unfiltered into the query interpreter.

Attack Vector

Exploitation occurs over the network against the /OnlineClassroom/studentlogin page. The attacker submits a manipulated sid value in a login request, transforming the intended authentication query into an attacker-controlled statement. Successful exploitation can return data from arbitrary tables, modify records, or facilitate authentication bypass against the student portal.

No verified proof-of-concept code is republished here. Technical details are described in the GitHub Issue Report referenced by the advisory.

Detection Methods for CVE-2026-7741

Indicators of Compromise

• HTTP POST or GET requests to /OnlineClassroom/studentlogin containing SQL metacharacters such as ', --, /*, UNION, or SLEEP( in the sid parameter.
• Web server access logs showing unusually long sid values, encoded payloads, or repeated login attempts from a single source.
• Database error messages or HTTP 500 responses correlated with login traffic, suggesting failed injection attempts.

Detection Strategies

• Deploy signature-based and anomaly-based web application firewall (WAF) rules targeting SQL injection patterns on the studentlogin URL path.
• Enable verbose application and database query logging to capture parameter values and detect malformed queries.
• Correlate authentication failures with SQL syntax errors using SIEM analytics to surface injection attempts.

Monitoring Recommendations

• Alert on bursts of failed student logins originating from single IP addresses or distributed sources targeting the same endpoint.
• Monitor outbound database query volume and latency for spikes indicative of mass data extraction.
• Track changes to user, session, and grade tables that occur outside normal application workflows.

How to Mitigate CVE-2026-7741

Immediate Actions Required

• Restrict access to the CodeAstro Online Classroom application using network controls or VPN until a vendor patch is available.
• Deploy WAF rules that reject SQL metacharacters in the sid parameter on /OnlineClassroom/studentlogin.
• Audit application and database logs for suspicious activity dating back to the application's deployment.
• Rotate any credentials or session tokens stored in the affected database after confirming integrity.

Patch Information

No official vendor patch has been published in the referenced advisories at the time of writing. Monitor the CodeAstro Security Blog and VulDB Vulnerability #360916 for updates. If a patch is unavailable, organizations should consider isolating or replacing the affected component.

Workarounds

• Modify the application source to replace string concatenation with parameterized queries or prepared statements for the sid parameter.
• Implement server-side input validation that enforces an allow-list (numeric or alphanumeric) for sid values before they reach the database layer.
• Apply database account hardening so the web application connects with the minimum privileges required, limiting injection impact.

# Example WAF rule (ModSecurity) blocking SQL metacharacters in the sid parameter
SecRule ARGS:sid "@rx (?i)(\b(union|select|insert|update|delete|drop|sleep|benchmark)\b|--|/\*|;|')" \
    "id:1027741,phase:2,deny,status:403,log,msg:'CVE-2026-7741 SQLi attempt on studentlogin sid parameter'"