CVE-2025-47441 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the 'Progress Bar' product developed by Chris Reynolds, up to version 2.2.3. Stored XSS occurs when malicious input is improperly neutralized during web page generation and is persistently stored on the target server, later executed in the browsers of users who access the affected content. This vulnerability allows an attacker with at least low privileges (PR:L) and requiring user interaction (UI:R) to inject malicious scripts that execute in the context of other users' browsers. The CVSS 3.1 base score of 6.5 indicates a medium severity, with network attack vector (AV:N), low attack complexity (AC:L), and scope change (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact includes partial confidentiality, integrity, and availability loss (C:L/I:L/A:L), which can lead to session hijacking, unauthorized actions on behalf of users, or defacement of web content. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability arises from insufficient input sanitization or encoding when generating web pages, allowing malicious payloads to be stored and later executed in victim browsers. This type of vulnerability is particularly dangerous in multi-user environments where untrusted input is displayed to other users, such as dashboards or progress tracking interfaces.

For European organizations using the Progress Bar product, this vulnerability poses a risk of unauthorized script execution within their web applications, potentially leading to data theft, session hijacking, or manipulation of displayed information. Given the scope change, attackers could leverage this vulnerability to affect multiple users beyond the initially compromised component, amplifying the impact. Organizations in sectors with high regulatory requirements for data protection, such as finance, healthcare, and public administration, could face compliance violations if sensitive user data is exposed or manipulated. The medium severity suggests that while exploitation is feasible, it requires some level of user interaction and privileges, limiting mass exploitation but still posing a significant risk in targeted attacks. The absence of known exploits reduces immediate threat but does not eliminate the risk, especially if threat actors develop weaponized payloads. European organizations should be vigilant, particularly those integrating this Progress Bar component in customer-facing or internal web applications where stored XSS can be exploited to compromise user trust and data integrity.

1. Immediate mitigation should include implementing strict input validation and output encoding on all user-supplied data rendered by the Progress Bar component to neutralize malicious scripts. 2. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. 3. Restrict privileges of users who can submit input to the Progress Bar to minimize the risk of malicious content injection. 4. Monitor web application logs for unusual input patterns or script injections indicative of attempted exploitation. 5. Since no official patch is currently linked, organizations should consider isolating or disabling the vulnerable Progress Bar functionality until a vendor patch is available. 6. Conduct regular security assessments and penetration tests focusing on input handling and stored XSS vectors in web applications using this component. 7. Educate developers and administrators on secure coding practices related to input sanitization and output encoding to prevent similar vulnerabilities in the future.