CVE-2024-6881 is a stored Cross-Site Scripting (XSS) vulnerability identified in M-Files Corporation's Hubshare product, affecting versions before 5.0.6.0. The root cause is improper neutralization of input during web page generation (CWE-79), allowing malicious JavaScript code to be stored on the server and executed in the context of other users' browsers. An attacker with authenticated access can inject malicious scripts into the application, which are then served to other users when they access the compromised content. This vulnerability does not require elevated privileges beyond authentication but does require user interaction to trigger the malicious script execution. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), user interaction required (UI:P), and high impact on confidentiality and integrity (VC:H, VI:H). The vulnerability does not affect availability or require scope changes. Although no public exploits are reported yet, the stored XSS nature makes it a significant risk for session hijacking, data theft, and unauthorized actions within the application. The vulnerability was reserved on July 18, 2024, and published on July 29, 2024. No official patch links are provided in the data, but upgrading to version 5.0.6.0 or later is implied as the remediation path.

This vulnerability poses a significant risk to organizations using affected versions of M-Files Hubshare, as it enables attackers to execute arbitrary JavaScript in the context of other users' sessions. Potential impacts include theft of session cookies, leading to account takeover, unauthorized access to sensitive information, and execution of actions on behalf of legitimate users. The integrity of user data and confidentiality of communications can be compromised. Since the attack requires authentication and user interaction, insider threats or compromised accounts can be leveraged to exploit this vulnerability. The widespread use of Hubshare in enterprise collaboration and document sharing environments means that sensitive corporate data could be exposed or manipulated. Additionally, attackers could use this vulnerability as a pivot point for further attacks within the victim's network. The absence of known exploits in the wild currently reduces immediate risk but does not diminish the urgency of remediation due to the ease of exploitation and high impact.

1. Upgrade M-Files Hubshare to version 5.0.6.0 or later as soon as the patch is available to fully remediate the vulnerability. 2. Implement strict input validation and output encoding on all user-supplied data to prevent injection of malicious scripts. 3. Employ Content Security Policy (CSP) headers to restrict the execution of untrusted scripts in users' browsers. 4. Limit user privileges and enforce the principle of least privilege to reduce the risk posed by authenticated attackers. 5. Monitor application logs and user activity for unusual behavior indicative of XSS exploitation attempts. 6. Educate users about the risks of interacting with suspicious links or content within Hubshare. 7. If immediate patching is not possible, consider disabling or restricting features that allow user-generated content until a fix is applied. 8. Conduct regular security assessments and penetration testing focused on web application vulnerabilities, including XSS.