CVE-2025-58671 is a high-severity Stored Cross-Site Scripting (XSS) vulnerability identified in the morganrichards Auction Feed product, affecting versions up to 1.1.3. The vulnerability arises due to improper neutralization of input during web page generation, classified under CWE-79. Specifically, the Auction Feed application fails to adequately sanitize or encode user-supplied input before rendering it in web pages, allowing malicious actors to inject and store arbitrary JavaScript code. When other users access the affected pages, the malicious script executes in their browsers within the context of the vulnerable site. The CVSS 3.1 base score of 7.1 reflects a network-exploitable vulnerability (AV:N) with low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The scope is changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component. The impact affects confidentiality, integrity, and availability to a limited extent (C:L, I:L, A:L). Although no known exploits are currently in the wild and no patches have been published, the vulnerability poses a significant risk due to the potential for session hijacking, credential theft, defacement, or distribution of malware via the injected scripts. Stored XSS is particularly dangerous because the malicious payload persists on the server and can affect multiple users over time. The lack of patches necessitates immediate attention from organizations using this product to prevent exploitation.

For European organizations utilizing the morganrichards Auction Feed, this vulnerability could lead to unauthorized access to user sessions, theft of sensitive information such as credentials or personal data, and potential defacement or manipulation of auction content. Given that auction platforms often handle financial transactions and user data, exploitation could result in financial fraud, reputational damage, and regulatory non-compliance under GDPR due to data breaches. The persistent nature of stored XSS increases the risk of widespread impact across users and systems. Additionally, attackers could leverage this vulnerability as a foothold for further attacks within the organization's network. The high connectivity and reliance on web-based auction services in Europe amplify the threat's potential impact, especially for e-commerce and auction businesses.

Organizations should immediately implement strict input validation and output encoding on all user-supplied data within the Auction Feed application to neutralize malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Since no official patches are currently available, consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block XSS payloads targeting this vulnerability. Conduct thorough security testing and code reviews focusing on input handling in the Auction Feed. Limit user privileges and implement multi-factor authentication to reduce the impact of potential session hijacking. Monitor logs for unusual activity indicative of exploitation attempts. Engage with the vendor for timely patch releases and apply them promptly once available. Additionally, educate users about the risks of interacting with suspicious auction content and encourage safe browsing practices.