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A Cross-Site Scripting (XSS) vulnerability exists within fields that accept custom URLs inside the Indico event management platform. This security flaw occurs because user-supplied input provided through custom URL link fields lacks proper sanitization and output encoding before being rendered back to the browser. When an authenticated user or administrator interacts with the affected component containing a maliciously crafted URL payload (such as a JavaScript URI scheme), the web browser executes the injected script within the context of the user’s session. This behavior compromises confidentiality and integrity by allowing arbitrary client-side script execution, potentially leading to session token theft, credential harvesting, or unauthorized actions performed on behalf of the victim. Remediating this issue requires updating the application software to version 3.3.13 or enforcing strict Content Security Policy headers via configuration adjustments.
DailyCVE Form:
Platform: Indico
Version: Prior to 3.3.13
Vulnerability : Cross-Site-Scripting
Severity: Moderate
date: August 25, 2026
Prediction: August 25, 2026
What Undercode Say:
Analytics
The vulnerability resides in the handling of link input vectors where URLs are accepted without proper contextual escaping. Attackers supply specially crafted payloads substituting safe URL schemes with executable JavaScript code. When the application renders the hyperlink element dynamically without structural validation, browsers evaluate the script upon user interaction.
Exploit: (Educational Purposes!)
<a href="javascript:alert(document.cookie)">Malicious Link</a>
Protection: from this CVE
Update to version 3.3.13 and add the following configuration rule in indico.conf:
CSP_ENABLED = True
Impact
Enables attackers to execute arbitrary JavaScript within victim browsers via custom link fields, risking session hijacking and data exposure.
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Sources:
Reported By: github.com
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