Executive brief
itsourcecode Electronic Judging System, a platform used for managing and scoring competitions, contains a security flaw in its administrative interface. An attacker can exploit this by tricking a user into clicking a malicious link, allowing the attacker to execute unauthorized scripts in the user's browser. This could lead to the theft of login sessions, unauthorized actions on behalf of the user, or the defacement of the judging platform.
Technical details
A reflected cross-site scripting (XSS) vulnerability exists in itsourcecode Electronic Judging System 1.0. The issue is located in the '/admin/judges.php' component and stems from insufficient sanitization of the 'fname' parameter. A remote attacker can exploit this by sending a specially crafted URL to a victim; when the victim visits the link, arbitrary JavaScript code is executed in their browser context. This can be used to hijack session cookies or perform unauthorized administrative actions. The exploit has been publicly disclosed with a proof-of-concept payload: <script>prompt(/xss/);</script>. No authentication is required to initiate the attack vector.
Affected products
- itsourcecode Electronic Judging System 1.0
Timeline
- 2026-04-28: disclosed: Vulnerability details and PoC shared on GitHub.
- 2026-05-26: advisory: CVE-2026-9527 published.