CVE-2025-45313 is a cross-site scripting (XSS) vulnerability identified in the /tasks endpoint of hortusfox-web version 4.4. This vulnerability arises due to insufficient input validation or output encoding of the 'title' parameter, allowing an attacker to inject malicious JavaScript code. When a user accesses a crafted URL or interacts with the affected endpoint containing the malicious payload, the injected script executes within the context of the victim's browser session. This can lead to session hijacking, theft of sensitive information such as cookies or tokens, unauthorized actions performed on behalf of the user, or redirection to malicious sites. The vulnerability is client-side focused but leverages a server-side flaw in input handling. No CVSS score has been assigned yet, and there are no known exploits in the wild. The affected version is hortusfox-web v4.4, but no further version details or patches have been provided. The vulnerability was published on August 13, 2025, with the initial reservation date on April 22, 2025.

For European organizations using hortusfox-web v4.4, this XSS vulnerability poses a significant risk to the confidentiality and integrity of user sessions and data. Attackers exploiting this flaw could impersonate legitimate users, access sensitive information, or perform unauthorized operations within the application. This is particularly concerning for organizations handling personal data under GDPR regulations, as exploitation could lead to data breaches and regulatory penalties. Additionally, the exploitation of XSS vulnerabilities can facilitate further attacks such as phishing or malware distribution, potentially impacting the organization's reputation and operational continuity. Since hortusfox-web is a web-based application, any European entity relying on it for task management or workflow processes could face service disruption or data compromise if this vulnerability is exploited.

Organizations should immediately review their deployment of hortusfox-web and identify if version 4.4 is in use. Since no official patch or update link is provided, administrators should implement the following mitigations: 1) Apply strict input validation and output encoding on the 'title' parameter at the application level to neutralize malicious scripts. 2) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 3) Use web application firewalls (WAFs) to detect and block malicious payloads targeting the /tasks endpoint. 4) Educate users to be cautious of suspicious links and implement multi-factor authentication to reduce the impact of session hijacking. 5) Monitor application logs for unusual activity related to the /tasks endpoint. 6) Engage with the vendor or community to obtain patches or updates addressing this vulnerability as they become available.