CVE-2025-49039 is a medium-severity vulnerability classified under CWE-79, which pertains to improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). This vulnerability affects the mibuthu Link View product, specifically versions up to and including 0.8.0. The flaw allows an attacker to inject malicious scripts that are stored persistently (Stored XSS) within the application. When a user accesses the affected page, the malicious script executes in the context of the victim's browser, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The CVSS v3.1 base score is 5.9, indicating a medium severity level. The vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L indicates that the attack can be launched remotely over the network with low attack complexity, but requires high privileges and user interaction. The scope is changed, meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality, integrity, and availability is low to moderate, as the attacker can partially compromise user data and application behavior but cannot fully control the system or cause complete denial of service. No known exploits are currently in the wild, and no patches have been linked yet. The vulnerability was reserved in May 2025 and published in August 2025, suggesting it is a recent discovery.

For European organizations using mibuthu Link View, this vulnerability poses a risk primarily to web application security and user data confidentiality. Stored XSS can be exploited to steal session cookies, enabling attackers to impersonate legitimate users, potentially gaining unauthorized access to sensitive information or internal systems. This can lead to data breaches, reputational damage, and regulatory non-compliance, especially under GDPR requirements for protecting personal data. The requirement for high privileges to exploit the vulnerability somewhat limits the attack surface, but insider threats or compromised accounts could still leverage this flaw. Additionally, the need for user interaction means phishing or social engineering could be used to trigger the exploit. The changed scope indicates that the impact could extend beyond the immediate application, possibly affecting other integrated systems or services. European organizations with public-facing or internal deployments of Link View should be particularly cautious, as exploitation could disrupt business operations and erode trust with customers and partners.

To mitigate this vulnerability effectively, European organizations should: 1) Immediately audit their use of mibuthu Link View to identify affected versions and isolate vulnerable instances. 2) Implement strict input validation and output encoding on all user-supplied data within the application to prevent script injection. 3) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 4) Enforce the principle of least privilege to limit user permissions, reducing the risk of high-privilege accounts being compromised. 5) Conduct user awareness training to minimize the risk of social engineering attacks that could trigger the stored XSS. 6) Monitor application logs and network traffic for unusual activities indicative of exploitation attempts. 7) Engage with mibuthu or the security community to obtain patches or updates as soon as they become available and apply them promptly. 8) Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting Link View. These measures go beyond generic advice by focusing on both technical controls and organizational practices tailored to the specifics of this vulnerability.