CVE-2026-23880 identifies a stored cross-site scripting (XSS) vulnerability in the OnboardLite membership lifecycle platform developed by HackUCF, primarily used for managing student organizations. The vulnerability exists in versions prior to commit 1d32081a66f21bcf41df1ecb672490b13f6e429f and stems from improper input validation (CWE-20) when an administrator attempts to migrate a user's Discord account through the platform's dashboard interface. Specifically, malicious input can be injected and stored within the system, which is then rendered in the admin's browser session without adequate sanitization or encoding, enabling execution of arbitrary JavaScript code. This can lead to unauthorized access to sensitive admin functions, theft of session tokens, or manipulation of administrative workflows, thereby compromising confidentiality and integrity. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N) indicates that the attack can be performed remotely over the network with low complexity, requires low privileges (an authenticated user with some rights), and user interaction (admin must view the malicious content). The scope remains unchanged, affecting only the vulnerable component. No known exploits have been reported in the wild, but the presence of this vulnerability in a platform managing membership lifecycles poses a significant risk if left unpatched. The patch, introduced in the specified commit, addresses the issue by implementing proper input validation and output encoding to prevent script injection. The vulnerability is tagged under CWE-20 (Improper Input Validation), CWE-79 (Improper Neutralization of Input During Web Page Generation - XSS), and CWE-116 (Improper Encoding or Escaping of Output).

For European organizations, particularly universities and student organizations that utilize OnboardLite or similar membership lifecycle platforms, this vulnerability poses a significant risk to administrative accounts and sensitive organizational data. Successful exploitation could allow attackers to execute arbitrary scripts in the context of admin users, leading to session hijacking, unauthorized access to confidential membership data, and potential manipulation of organizational workflows. This could result in data breaches, loss of trust, and disruption of student organization management. Given the administrative nature of the affected functionality, the impact on confidentiality and integrity is high, although availability is not directly affected. The risk is amplified in environments where multiple administrators share access or where the platform integrates with other critical systems. Additionally, the vulnerability could be leveraged as a foothold for further attacks within the network. The absence of known exploits in the wild suggests a window of opportunity for defenders to patch and mitigate before active exploitation occurs.

European organizations should immediately verify their OnboardLite version and upgrade to the patched commit 1d32081a66f21bcf41df1ecb672490b13f6e429f or later. Beyond applying the patch, organizations should implement strict input validation on all user-supplied data, especially in administrative interfaces, ensuring that inputs conform to expected formats and reject any suspicious content. Output encoding should be enforced to neutralize any potentially malicious scripts before rendering in browsers. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the admin dashboard. Regularly audit and monitor logs for unusual admin dashboard activity that could indicate attempted exploitation. Conduct security awareness training for administrators to recognize suspicious behavior and avoid interacting with untrusted inputs. Finally, consider implementing multi-factor authentication (MFA) for admin accounts to reduce the risk of session hijacking consequences.