CVE-2025-49337 is a Stored Cross-site Scripting (XSS) vulnerability classified under CWE-79 affecting janhenckens Dashboard Beacon up to version 1.2.0. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows malicious scripts to be stored and later executed in the context of authenticated users viewing the dashboard. This type of XSS can lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The CVSS 3.1 vector indicates the attack can be launched remotely over the network (AV:N) with low attack complexity (AC:L), but requires the attacker to have high privileges (PR:H) and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact includes low confidentiality, integrity, and availability impacts, but the combined effect can still be significant in sensitive environments. No patches or known exploits are currently available, so organizations must proactively assess and mitigate the risk. The vulnerability was reserved in June 2025 and published at the end of 2025, indicating recent discovery and disclosure.

For European organizations, this vulnerability poses a risk primarily to those using janhenckens Dashboard Beacon in environments where privileged users interact with the dashboard. Successful exploitation could lead to unauthorized script execution, enabling attackers to steal sensitive information, manipulate dashboard data, or perform actions with the victim's privileges. This can undermine trust in monitoring and management systems, potentially disrupting operations or leading to data breaches. Sectors such as finance, healthcare, critical infrastructure, and government agencies that rely on Dashboard Beacon for real-time monitoring may face increased risk. The requirement for high privileges and user interaction limits the attack surface but does not eliminate it, especially in environments with multiple administrators or users with elevated rights. The absence of known exploits reduces immediate risk but does not preclude targeted attacks or future exploit development.

To mitigate CVE-2025-49337, organizations should implement strict input validation and output encoding on all user-supplied data rendered in the Dashboard Beacon interface. Employ Content Security Policy (CSP) headers to restrict script execution sources and reduce the impact of potential XSS payloads. Limit the number of users with high privileges to reduce the attack surface and enforce the principle of least privilege. Monitor user activity for suspicious behavior that could indicate exploitation attempts. Since no official patches are available yet, consider isolating or restricting access to the Dashboard Beacon application until a fix is released. Engage with janhenckens or the vendor community for updates and apply patches promptly once available. Additionally, conduct security awareness training for users to recognize and avoid interacting with suspicious content that could trigger stored XSS attacks.