CVE-2022-41789 is a Cross-site Scripting (XSS) vulnerability identified in the BlueSpice software, specifically within the BlueSpiceDiscovery skin of the product version 4, developed by Hallo Welt! GmbH. This vulnerability allows a logged-in user who possesses edit permissions to inject arbitrary HTML code into the default page header of a wiki page. The injection occurs because the input is not properly sanitized or escaped before being rendered in the page header, enabling the execution of malicious scripts in the context of other users viewing the affected wiki pages. The vulnerability is classified under CWE-79, which pertains to improper neutralization of input during web page generation, leading to XSS attacks. The CVSS v3.1 base score is 3.3, indicating a low severity level. The vector string (AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N) shows that the attack requires local access (AV:L), low attack complexity (AC:L), privileges (PR:L) to edit content, no user interaction (UI:N), unchanged scope (S:U), and impacts confidentiality to a low degree (C:L) without affecting integrity or availability. There are no known exploits in the wild, and no patches are explicitly linked in the provided data. The vulnerability is limited to authenticated users with editing rights, which restricts the attack surface but still poses a risk of persistent XSS that could be leveraged for session hijacking, phishing, or other malicious activities within the wiki environment.

For European organizations using BlueSpice version 4, particularly those relying on it for internal knowledge management or collaborative documentation, this vulnerability could lead to unauthorized script execution within their trusted wiki environment. Although the impact is rated low, the ability for an attacker with edit permissions to inject malicious HTML can compromise user confidentiality by stealing session tokens or credentials. This could facilitate lateral movement or privilege escalation within the organization’s intranet. The risk is heightened in environments where many users have edit rights or where the wiki is accessible to a broad internal user base. Given that BlueSpice is often used by public sector entities, educational institutions, and enterprises in Europe, exploitation could undermine trust in internal communication platforms and potentially expose sensitive organizational information. However, since the vulnerability does not affect integrity or availability directly and requires authenticated access, the overall operational disruption is limited. The absence of known exploits in the wild suggests that the threat is currently low but should not be ignored, especially in sectors with high compliance requirements such as finance, healthcare, and government.

To mitigate this vulnerability, organizations should first verify whether they are running BlueSpice version 4 with the BlueSpiceDiscovery skin enabled. Since no official patch links are provided, administrators should monitor Hallo Welt! GmbH’s official channels for updates or patches addressing CVE-2022-41789. In the interim, restricting edit permissions to only trusted users and minimizing the number of users with such privileges will reduce the attack surface. Implementing Content Security Policy (CSP) headers can help limit the impact of injected scripts by restricting the sources from which scripts can be loaded or executed. Additionally, administrators can review and sanitize existing wiki page headers to detect and remove any unauthorized HTML injections. Employing web application firewalls (WAFs) with custom rules to detect and block suspicious HTML or script injection attempts targeting the wiki can provide an additional layer of defense. Regular security audits and user training on safe editing practices will also help prevent exploitation. Finally, consider isolating the wiki environment within a segmented network zone to limit potential lateral movement if exploitation occurs.