CVE-2025-63543 identifies a Cross Site Scripting (XSS) vulnerability in TechStore version 1.0, specifically within the /search_results endpoint via the q parameter. This vulnerability arises because the application fails to properly sanitize or encode user-supplied input in the search query parameter before reflecting it back in the HTML response. As a result, an attacker can craft a malicious URL containing executable JavaScript code that, when accessed by a victim, runs in their browser context. The vulnerability is classified under CWE-79, indicating improper neutralization of input during web page generation. The CVSS v3.1 base score is 6.1, with vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, meaning the attack can be launched remotely over the network without privileges, requires low attack complexity, no privileges, but does require user interaction. The scope is changed (S:C), indicating that the vulnerability affects components beyond the vulnerable component itself, potentially impacting the entire user session or application state. The impact on confidentiality and integrity is low, as attackers can steal session tokens or manipulate displayed content, but availability is not affected. No patches or known exploits are currently available, suggesting the vulnerability is newly disclosed. The lack of affected version details beyond TechStore 1.0 implies the vulnerability is limited to this version. This type of XSS can facilitate phishing, session hijacking, or defacement attacks if exploited.

For European organizations using TechStore 1.0, this XSS vulnerability poses risks primarily to the confidentiality and integrity of user sessions and data. Attackers could steal cookies or authentication tokens, enabling unauthorized access to user accounts or impersonation. Manipulation of web content could mislead users, potentially facilitating phishing or fraud. Although availability is not impacted, the reputational damage and potential regulatory consequences under GDPR for data breaches involving personal data could be significant. E-commerce platforms and customer-facing portals are particularly at risk, as attackers may exploit the vulnerability to target customers or employees. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially if attackers use social engineering to lure victims to malicious URLs. The vulnerability could also be chained with other exploits to escalate impact. Organizations may face compliance challenges if they fail to remediate known vulnerabilities affecting personal data processing.

Since no official patches are currently available, European organizations should implement immediate compensating controls. First, apply strict input validation and output encoding on the q parameter to neutralize malicious scripts, ideally using a secure web application firewall (WAF) with custom rules to detect and block XSS payloads targeting the /search_results endpoint. Deploy Content Security Policy (CSP) headers to restrict script execution sources and reduce the impact of injected scripts. Educate users and staff about the risks of clicking on suspicious links, especially those involving search URLs. Monitor web server logs for unusual query parameter patterns indicative of exploitation attempts. If possible, upgrade or migrate from TechStore 1.0 to a more secure version or alternative platform. Conduct regular security assessments and penetration tests focusing on input handling and reflected XSS vulnerabilities. Coordinate with vendors for timely patch releases and apply them promptly once available. Implement multi-factor authentication to reduce the impact of stolen session tokens. Finally, ensure incident response plans include scenarios involving XSS exploitation.