CVE-2026-63157 in Agora Project
Summary
by MITRE • 10/14/2026
Omnispace Agora Project before 26.10.0 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts by submitting an unsanitized link address (adress) field that is echoed into an onclick event-handler attribute without neutralizing quotes. Attackers can store a crafted payload through the Links module that executes in the browser of any user viewing the links list, enabling session hijacking or further client-side compromise.
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Analysis
by VulDB Data Team • 10/14/2026
The Omnispace Agora Project prior to version 26.10.0 is susceptible to a stored cross-site scripting vulnerability within its Links management module. This security flaw arises from inadequate input validation and output encoding mechanisms when handling user-supplied data, specifically the link address field. The application fails to properly sanitize or encode special characters before storing them in the backend database and subsequently rendering them back into the HTML context without neutralizing quotes. Consequently, an attacker who has valid authentication credentials can inject malicious JavaScript code by crafting a specially formatted URL string that breaks out of the expected data structure. This payload is then persisted on the server side rather than being executed immediately during submission, which classifies this as a stored or persistent cross-site scripting vulnerability rather than a reflected variant.
The technical mechanism of exploitation involves submitting an unsanitized link address through the Links module interface. Because the application echoes this input directly into an onclick event-handler attribute without escaping quotes, the injected script can break out of the HTML string context and execute within the victim's browser environment. Any authenticated user who views the list of links will trigger the execution of the malicious payload as part of their normal browsing session. This persistence ensures that every subsequent visit to the affected page results in code execution, significantly increasing the attack surface compared to transient vulnerabilities. The lack of proper context-aware encoding allows standard JavaScript syntax to be interpreted by the browser's engine rather than being treated as inert text data.
The operational impact of this vulnerability is severe due to its ability to facilitate session hijacking and further client-side compromise. By executing arbitrary scripts in the context of the vulnerable application, an attacker can access sensitive information such as authentication cookies, session tokens, or personal user data stored within local storage or indexed databases. This capability allows for complete account takeover without requiring password resets or additional exploitation steps beyond initial authenticated access. Furthermore, the injected script can perform actions on behalf of the victim, including modifying settings, exfiltrating confidential documents, or redirecting users to phishing sites designed to capture further credentials. The persistent nature of this flaw means that remediation requires not only patching the application but also purging any previously stored malicious payloads from the database to fully restore security integrity.
From a classification perspective, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific vector involves storing untrusted data in a web application and later retrieving it for use in a vulnerable context, fitting the profile of persistent XSS attacks. In terms of adversary tactics, this aligns with MITRE ATT&CK technique T1059, Command and Scripting Interpreter, specifically JavaScript execution within a browser environment. It also relates to T1213, Data from Information Repositories, as attackers leverage stored data to execute further malicious actions against other users or systems connected to the same session infrastructure.
Mitigation strategies must focus on both immediate remediation and long-term defensive coding practices. The primary solution is to upgrade the Omnispace Agora Project to version 26.10.0 or later, where these input validation flaws have been addressed by developers through proper encoding routines. For environments unable to patch immediately, implementing a Web Application Firewall with rules capable of detecting and blocking script injection patterns in form submissions can provide temporary protection. Additionally, security teams should enforce strict output encoding using context-specific methods such as HTML entity encoding for data inserted into HTML bodies or attribute values. Input validation should also be strengthened by whitelisting allowed characters for link addresses rather than relying solely on blacklist approaches, which are prone to bypasses through obfuscation techniques. Regular code reviews and static application security testing can help identify similar vulnerabilities in other modules before they reach production environments.