CVE-2026-38671 in Banner Student Registration Self-Service
Summary
by MITRE • 10/19/2026
Cross Site Scripting vulnerability in Ellucian Banner Student Registration Self-Service (StudentRegistrationSsb) 9.23 and prior (no fixed version available) allows a remote attacker to execute arbitrary code via the mepCode parameter of the /ssb/registration endpoint
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Analysis
by VulDB Data Team • 10/19/2026
The identified security flaw resides within Ellucian Banner Student Registration Self-Service, specifically affecting versions up through 9.23 where no definitive patch has been released by the vendor. This vulnerability is classified as a Cross-Site Scripting issue, which fundamentally stems from insufficient validation and sanitization of user-supplied input before it is processed or rendered by the web application. The specific point of failure involves the mepCode parameter associated with the /ssb/registration endpoint. In typical web application architecture, this endpoint handles data related to student registration processes, making it a high-value target for attackers seeking to compromise academic records or disrupt institutional operations.
From a technical perspective, the vulnerability allows a remote attacker to inject malicious scripts into pages viewed by other users. When an unsuspecting user accesses a manipulated URL containing the crafted mepCode payload, the browser executes the injected script within the context of the trusted Ellucian Banner domain. This bypasses standard security controls such as the same-origin policy, enabling the malicious code to access cookies, session tokens, and other sensitive data stored by the browser for that site. The lack of a fixed version indicates that this is either an unpatched legacy issue or one requiring significant architectural changes to resolve, leaving organizations with older deployments in a state of prolonged exposure.
The operational impact of this vulnerability extends beyond simple defacement or nuisance scripts. Attackers can leverage Cross-Site Scripting for session hijacking by stealing authentication cookies, thereby gaining unauthorized access to student accounts without needing valid credentials. Furthermore, the attacker could perform actions on behalf of the victim, such as altering registration preferences, changing personal information, or accessing sensitive academic records. In an institutional setting, this compromises the confidentiality and integrity of student data, potentially violating privacy regulations like FERPA in the United States or GDPR in Europe if personally identifiable information is exposed. The ability to execute arbitrary code also opens avenues for phishing attacks where users are redirected to malicious sites designed to harvest additional credentials.
This vulnerability maps directly to CWE-79: Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting (XSS). Specifically, it represents a Reflected XSS scenario if the payload is executed immediately upon request processing without being stored in the database, or Stored XSS if the malicious mepCode persists and affects multiple users over time. In terms of offensive security frameworks, this aligns with MITRE ATT&CK technique T1059: Command and Scripting Interpreter, as it allows for arbitrary code execution within the client-side environment. It also relates to T1203: Exploitation for Client Execution, where the vulnerability serves as a vector to deliver malicious payloads that run on the victim's machine.
Mitigation strategies must be immediate given the absence of an official patch from Ellucian. Organizations should implement Web Application Firewall rules designed to detect and block requests containing script tags, event handlers, or encoded variants thereof within the mepCode parameter. Input validation is critical; developers or system administrators should enforce strict allow-listing for this parameter, ensuring that only expected alphanumeric characters are accepted. Additionally, output encoding must be applied consistently across all views rendering user-supplied data to ensure special characters are rendered as text rather than executable code. Enforcing Content Security Policy headers can further mitigate the impact by restricting the sources from which scripts can be loaded and executed. Regular security assessments and penetration testing should be conducted to identify similar injection points in other endpoints of the Banner system, ensuring a comprehensive defense-in-depth approach until an official update is available.