CVE-2025-29746 is a Cross Site Scripting (XSS) vulnerability identified in Koillection version 1.6.10. This vulnerability allows a remote attacker to escalate privileges by exploiting the collection, Wishlist, and album components of the application. XSS vulnerabilities occur when an application includes untrusted data in a web page without proper validation or escaping, enabling attackers to inject malicious scripts that execute in the context of the victim's browser. In this case, the vulnerability affects key user-interactive components, potentially allowing attackers to perform actions on behalf of other users or steal sensitive information such as session tokens. The CVSS 3.1 base score is 6.1, indicating a medium severity level. The vector string (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) shows that the attack can be performed remotely over the network without privileges, requires low attack complexity, but does require user interaction (e.g., clicking a malicious link). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality and integrity is low, while availability is not affected. No patches or known exploits in the wild have been reported yet. The vulnerability is categorized under CWE-79, which is the standard classification for XSS issues. The lack of vendor and product details limits precise identification, but the affected components suggest a web-based application with user-generated content features.

For European organizations using Koillection v1.6.10, this vulnerability poses a risk of privilege escalation through client-side attacks. Attackers could craft malicious links or content that, when interacted with by users, execute scripts in their browsers. This can lead to theft of session cookies, enabling unauthorized access to user accounts, or manipulation of user data within collections, Wishlists, or albums. Such unauthorized access can compromise user privacy and data integrity, potentially leading to reputational damage and regulatory non-compliance under GDPR if personal data is exposed. The changed scope indicates that the attack could affect multiple components or user sessions beyond the initially targeted area, increasing the risk of broader compromise. Although availability is not impacted, the confidentiality and integrity risks are significant enough to warrant prompt attention. The requirement for user interaction means phishing or social engineering could be used to exploit this vulnerability. European organizations with public-facing Koillection deployments, especially those handling sensitive or personal data, should consider this a moderate threat that could facilitate further attacks if left unmitigated.

To mitigate this vulnerability, organizations should first verify if an official patch or update from the Koillection developers becomes available and apply it promptly. In the absence of a patch, implement strict input validation and output encoding on all user-supplied data within the collection, Wishlist, and album components to neutralize malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Additionally, educate users to be cautious about clicking on suspicious links or interacting with untrusted content. Web Application Firewalls (WAFs) can be configured to detect and block common XSS attack patterns targeting these components. Regular security testing, including automated scanning and manual penetration testing focused on XSS vectors, should be conducted to identify and remediate similar vulnerabilities. Monitoring logs for unusual activity related to these components can help detect exploitation attempts early. Finally, ensure session management is robust, with secure cookie flags and short session lifetimes to limit the impact of stolen credentials.