CVE-2025-7871 is a cross-site scripting (XSS) vulnerability identified in Portabilis i-Diario version 1.5.0, a software product likely used for educational or administrative purposes given the context of its name. The vulnerability arises from improper sanitization of user input in the 'filter[by_description]' parameter within the /conteudos endpoint. An attacker can remotely craft malicious input that, when processed by the vulnerable application, results in the injection and execution of arbitrary JavaScript code in the context of the victim's browser session. This type of vulnerability can lead to session hijacking, defacement, or redirection to malicious sites. The vulnerability is classified as 'problematic' and has a CVSS 4.0 score of 5.1, indicating a medium severity level. The attack vector is network-based with low attack complexity, no privileges required, but does require user interaction (e.g., victim clicking a crafted link). The vendor was notified but has not responded or issued a patch, and no known exploits are currently observed in the wild. The vulnerability does not affect confidentiality or availability directly but impacts integrity and user trust due to potential script execution in user browsers. Given the public disclosure and lack of vendor response, the risk of exploitation may increase over time.

For European organizations using Portabilis i-Diario 1.5.0, this vulnerability poses a moderate risk primarily to the integrity of user sessions and the security of end users interacting with the application. Educational institutions or administrative bodies relying on this software could see attackers inject malicious scripts that steal session cookies, perform unauthorized actions on behalf of users, or deliver phishing payloads. This could lead to unauthorized access to sensitive educational data or disruption of normal operations. While the vulnerability does not directly compromise system availability or confidentiality of stored data, the exploitation could erode user trust and potentially lead to broader security incidents if combined with other vulnerabilities or social engineering. The lack of a vendor patch increases the urgency for organizations to implement compensating controls. The impact is particularly relevant for organizations with a large user base interacting with the affected endpoint, especially if users have elevated privileges or access to sensitive information.

Since no official patch is available, European organizations should implement several specific mitigations: 1) Employ Web Application Firewalls (WAFs) with custom rules to detect and block malicious payloads targeting the 'filter[by_description]' parameter. 2) Conduct input validation and output encoding on the server side if possible, or apply reverse proxies that sanitize inputs to the vulnerable endpoint. 3) Educate users about the risks of clicking on suspicious links and encourage the use of security-aware browsing practices. 4) Monitor application logs for unusual input patterns or spikes in requests to the /conteudos endpoint. 5) Isolate the affected application in a segmented network zone to limit lateral movement in case of compromise. 6) Consider upgrading or migrating to alternative software solutions if feasible. 7) Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. These targeted mitigations go beyond generic advice and address the specific nature of the vulnerability and the current lack of vendor remediation.