CVE-2025-7857 is a cross-site scripting (XSS) vulnerability identified in version 1.0 of the PHPGurukul Apartment Visitors Management System. The vulnerability exists in the HTTP POST request handler within the file bwdates-passreports-details.php, specifically involving the manipulation of the 'visname' parameter. An attacker can craft a malicious payload and inject it into this parameter, which is then improperly sanitized or encoded, allowing the execution of arbitrary scripts in the context of the victim's browser. This vulnerability is exploitable remotely without requiring authentication, although it does require user interaction (e.g., a victim clicking a malicious link or submitting a crafted form). The CVSS 4.0 base score is 5.1, indicating a medium severity level. The vector details show that the attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:L - low privileges), and user interaction is needed (UI:P). The vulnerability impacts the confidentiality and integrity of user data by potentially allowing session hijacking, credential theft, or unauthorized actions performed on behalf of the user. Availability is not directly impacted. No patches or fixes have been disclosed yet, and no known exploits are currently observed in the wild. However, the public disclosure of the exploit code increases the risk of exploitation. The vulnerability affects only version 1.0 of the product, which is a niche visitor management system used primarily in apartment complexes to track visitor information.

For European organizations, especially residential property management companies and apartment complexes using PHPGurukul Apartment Visitors Management System 1.0, this vulnerability poses a risk to the security and privacy of residents and visitors. Exploitation could lead to theft of session cookies, enabling attackers to impersonate users and access sensitive visitor logs or personal data. This could result in privacy violations and potential regulatory non-compliance under GDPR, given the handling of personal visitor information. Additionally, attackers could inject malicious scripts to perform phishing or deliver malware to users interacting with the system. While the direct impact on operational availability is limited, the reputational damage and potential legal consequences could be significant. The medium severity rating reflects the moderate risk, but the ease of remote exploitation without authentication increases the urgency for mitigation.

1. Immediate mitigation should include implementing proper input validation and output encoding on the 'visname' parameter in bwdates-passreports-details.php to neutralize malicious scripts. 2. Apply Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the application context. 3. If patching is not immediately available, consider deploying a Web Application Firewall (WAF) with rules to detect and block XSS payloads targeting the vulnerable parameter. 4. Conduct user awareness campaigns to educate residents and staff about the risks of clicking suspicious links or submitting untrusted forms related to the visitor management system. 5. Monitor logs for unusual activity or repeated attempts to exploit the 'visname' parameter. 6. Engage with the vendor (PHPGurukul) to obtain or request an official patch or update. 7. Where feasible, isolate the visitor management system from public internet access or restrict access to trusted networks only, reducing the attack surface.