CVE-2025-58114 is a medium-severity vulnerability identified in the Hallo Welt! GmbH BlueSpice software, specifically within the CognitiveProcessDesigner extension for versions 5 through 5.1.1. The vulnerability stems from improper input validation (CWE-20), which allows an attacker to perform Cross-Site Scripting (XSS) attacks. XSS vulnerabilities occur when an application does not properly sanitize user-supplied input, enabling attackers to inject malicious scripts into web pages viewed by other users. In this case, the BlueSpice extension fails to adequately validate or sanitize inputs, allowing an attacker with low privileges and requiring user interaction to execute scripts in the context of another user’s browser session. The CVSS 4.0 vector indicates the attack can be launched remotely over the network (AV:N) with low attack complexity (AC:L), but requires privileges (PR:L) and user interaction (UI:P). The vulnerability impacts the confidentiality of user data (VC:H), with limited impact on integrity (VI:L), and no impact on availability (VA:N). No known exploits are currently in the wild, and no patches have been published yet. The vulnerability was publicly disclosed on September 19, 2025.

For European organizations using BlueSpice, particularly those leveraging the CognitiveProcessDesigner extension, this vulnerability poses a risk of session hijacking, credential theft, or unauthorized actions performed via injected scripts. Since BlueSpice is a wiki and knowledge management platform often used in enterprise environments for collaboration and documentation, exploitation could lead to leakage of sensitive internal information or disruption of workflows. The requirement for user interaction means phishing or social engineering could be used to trigger the attack, increasing risk in environments with less security awareness. Confidentiality impact is high, as attackers could steal cookies or tokens, but the limited integrity and availability impact reduces the risk of system-wide disruption. Organizations in sectors with strict data privacy regulations (e.g., GDPR) must be cautious, as data leakage could lead to compliance violations and reputational damage.

Organizations should implement the following specific mitigations: 1) Immediately audit and restrict user input fields related to the CognitiveProcessDesigner extension to ensure proper sanitization and encoding of all inputs. 2) Apply strict Content Security Policy (CSP) headers to limit the execution of unauthorized scripts within BlueSpice pages. 3) Educate users on phishing and social engineering tactics to reduce the likelihood of user interaction triggering the exploit. 4) Monitor web application logs for suspicious input patterns or unusual user activity related to BlueSpice. 5) Coordinate with Hallo Welt! GmbH to obtain patches or updates as soon as they become available and prioritize their deployment. 6) Consider isolating or disabling the CognitiveProcessDesigner extension temporarily if feasible until a patch is applied. 7) Employ web application firewalls (WAFs) with rules targeting XSS payloads specific to BlueSpice to provide an additional layer of defense.