CVE-2025-53462 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 specific vulnerability affects the SAPO Feed product, up to version 2.4.2. The flaw allows for Stored XSS attacks, where malicious scripts injected by an attacker are permanently stored on the target server and subsequently executed in the browsers of users who access the affected content. The vulnerability arises due to insufficient input sanitization or encoding during the generation of web pages, enabling attackers to embed malicious JavaScript code within the application’s content. According to the CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L), the attack can be launched remotely over the network with low attack complexity but requires high privileges and user interaction. The scope is changed, indicating that the vulnerability can affect resources beyond the initially vulnerable component. The impact includes limited confidentiality, integrity, and availability losses, as the injected scripts could steal user data, manipulate displayed content, or disrupt service availability. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was reserved in June 2025 and published in September 2025, indicating it is a recent discovery.

For European organizations using SAPO Feed, this vulnerability poses a tangible risk of client-side attacks that could compromise user sessions, steal sensitive information such as authentication tokens, or perform unauthorized actions on behalf of users. Given the stored nature of the XSS, any user accessing the compromised feed content could be affected, potentially leading to widespread impact within organizations relying on SAPO Feed for content aggregation or distribution. The requirement for high privileges to exploit suggests that insider threats or compromised administrative accounts could be leveraged to inject malicious scripts, increasing the risk from internal threat actors. The vulnerability’s scope change means that the attack could impact other components or users beyond the immediate SAPO Feed interface, potentially affecting integrated systems or services. This could lead to reputational damage, regulatory compliance issues under GDPR due to data leakage, and operational disruptions. The absence of known exploits provides a window for mitigation but also implies that organizations should proactively address the vulnerability to prevent future exploitation.

Organizations should immediately audit their SAPO Feed deployments to identify affected versions (up to 2.4.2) and restrict administrative access to trusted personnel to reduce the risk of privilege abuse. Implement strict input validation and output encoding on all user-supplied data within SAPO Feed, especially in areas generating web content. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. Monitor logs for unusual administrative activities that could indicate attempts to inject malicious content. Since no official patches are currently linked, consider applying virtual patching via Web Application Firewalls (WAFs) configured to detect and block typical XSS payloads targeting SAPO Feed. Educate users about the risks of interacting with suspicious content and enforce multi-factor authentication (MFA) for administrative accounts to mitigate the risk of credential compromise. Regularly check for updates from SAPO regarding patches or security advisories and plan for timely application once available.