CVE-2025-7760 identifies a Cross-site Scripting (XSS) vulnerability classified under CWE-79 in the Ofisimo Web-Based Software Technologies' Association Web Package Flora, specifically versions 3.0 through 03022026. The vulnerability stems from improper neutralization of input during web page generation, allowing malicious scripts to be injected via HTTP headers. This type of XSS occurs when user-controllable data in HTTP headers is not correctly sanitized or encoded before being reflected in web pages, enabling attackers to execute arbitrary JavaScript in the context of the victim's browser. The CVSS 3.1 score of 7.6 indicates a high-severity issue with network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L) but no user interaction (UI:N), and impacting confidentiality, integrity, and availability. The vulnerability can be exploited remotely by an attacker with low privileges on the network, potentially leading to session hijacking, data leakage, or denial of service through crafted HTTP headers. The vendor has not responded to early disclosure attempts, and no patches or mitigations have been published, increasing the risk window. The lack of known exploits in the wild currently suggests limited active exploitation, but the vulnerability's nature and severity warrant immediate defensive measures. The issue affects web applications deployed with this software, which may be used by organizations for association management and related web services.

For European organizations using the Association Web Package Flora, this vulnerability poses significant risks. Exploitation could lead to unauthorized disclosure of sensitive information, including session tokens or personal data, compromising confidentiality. Integrity may be affected as attackers could manipulate web content or perform actions on behalf of authenticated users. Availability impact is rated high, as attackers might disrupt services by injecting malicious scripts that cause application errors or crashes. Given the web-based nature of the software, public-facing services are particularly vulnerable, potentially affecting member associations, NGOs, or other entities relying on this platform. The absence of vendor patches increases exposure duration, elevating the risk of targeted attacks. Additionally, regulatory frameworks like GDPR impose strict requirements on data protection; exploitation leading to data breaches could result in legal and financial penalties for affected organizations. The vulnerability's exploitation ease and network accessibility make it a credible threat to European entities with deployments of this software.

Since no official patches are available, European organizations should implement immediate compensating controls. First, enforce strict input validation and output encoding on all HTTP headers processed by the application to neutralize malicious scripts. Employ Web Application Firewalls (WAFs) configured with custom rules to detect and block suspicious HTTP header content indicative of XSS attempts. Conduct thorough code reviews and security testing focusing on header handling routines. Limit privileges of users and services interacting with the web application to reduce exploitation scope. Monitor web server and application logs for anomalous header values or repeated injection attempts. Consider isolating the affected application behind reverse proxies that can sanitize headers. Engage with Ofisimo or community forums to track any forthcoming patches or advisories. Finally, educate administrators and developers about secure coding practices related to header processing to prevent similar vulnerabilities.