Reflected XSS in Ellucian Banner Self-Service

Executive Summary

CVE-2026-32856 is a reflected cross-site scripting (XSS) vulnerability in Ellucian Banner Self-Service software versions before the April T2 release (2025-04-23).

The vulnerability exists in the dateConverter endpoint, specifically in the toDateFormat request parameter, which does not properly sanitize user input.

This flaw allows unauthenticated attackers to inject and execute arbitrary JavaScript code in the browser of a victim who clicks on a maliciously crafted URL targeting this endpoint.

Exploitation can lead to actions such as stealing session cookies or performing other malicious activities within the victim's browser session.

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Impact Analysis

This vulnerability can impact users by allowing attackers to execute arbitrary JavaScript in their browsers without authentication.

Attackers can steal session cookies, which may enable them to hijack user sessions and gain unauthorized access to user accounts or sensitive information.

Other malicious actions could be performed within the context of the victim's browser session, potentially compromising user data and security.

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Detection Guidance

This vulnerability can be detected by testing the dateConverter endpoint of Ellucian Banner Self-Service for reflected cross-site scripting (XSS) via the toDateFormat request parameter.

A common detection method is to craft a URL targeting the dateConverter endpoint with a payload in the toDateFormat parameter that includes JavaScript code, then observe if the input is reflected unsanitized in the response.

For example, you can use curl or a web proxy tool to send a request like:

• curl -v "http://[target]/dateConverter?toDateFormat=<script>alert(1)</script>"

If the response contains the injected script tag without proper sanitization or encoding, it indicates the presence of the vulnerability.

Additionally, web vulnerability scanners that test for reflected XSS vulnerabilities can be used to automate detection.

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Mitigation Strategies

The immediate mitigation step is to upgrade Ellucian Banner Self-Service to the April T2 release (2025-04-23) or later, where this vulnerability has been addressed.

Until the upgrade can be applied, consider implementing web application firewall (WAF) rules to block or sanitize requests containing suspicious input in the toDateFormat parameter targeting the dateConverter endpoint.

Also, educate users to be cautious about clicking on suspicious links that may exploit this reflected XSS vulnerability.

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Compliance Impact

The provided information does not specify how the reflected cross-site scripting vulnerability in Ellucian Banner Self-Service impacts compliance with common standards and regulations such as GDPR or HIPAA.

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