CVE-2025-7767 is a cross-site scripting (XSS) vulnerability identified in version 1.1 of the PHPGurukul Art Gallery Management System, specifically within the /admin/edit-art-medium-detail.php file. The vulnerability arises from improper sanitization or validation of the 'artmed' parameter, which can be manipulated by an attacker to inject malicious scripts. This flaw allows an attacker to execute arbitrary JavaScript code in the context of the affected web application. The attack vector is remote, requiring no prior authentication, but user interaction is necessary to trigger the malicious script, typically by an administrator or user accessing the crafted URL or input. The CVSS 4.0 base score is 5.1, indicating a medium severity level. The vulnerability impacts the confidentiality and integrity of the system by potentially allowing session hijacking, credential theft, or unauthorized actions performed on behalf of the user. Availability impact is minimal. Although no known exploits are currently observed in the wild, the public disclosure of the exploit code increases the risk of exploitation. The vulnerability does not require privileges but does require user interaction, which somewhat limits the ease of exploitation. The absence of a patch link suggests that a fix may not yet be available, increasing the urgency for mitigation through other means.

For European organizations using the PHPGurukul Art Gallery Management System version 1.1, this vulnerability poses a moderate risk. Successful exploitation could lead to unauthorized access to administrative functions, theft of sensitive information, or manipulation of gallery data. Given that the vulnerability is in an administrative interface, attackers could leverage XSS to hijack sessions of privileged users, potentially leading to broader compromise of the system. This could affect confidentiality and integrity of organizational data, particularly in cultural institutions, museums, or galleries that rely on this software. The impact extends to reputational damage and potential regulatory consequences under GDPR if personal data is compromised. The medium severity and requirement for user interaction mean that exploitation is plausible but not trivial. However, the public availability of exploit details increases the likelihood of targeted attacks, especially against institutions with limited cybersecurity defenses.

European organizations should immediately implement input validation and output encoding on the 'artmed' parameter within the /admin/edit-art-medium-detail.php file to prevent script injection. Until an official patch is released, organizations should consider the following measures: 1) Restrict access to the administrative interface by IP whitelisting or VPN-only access to reduce exposure. 2) Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts. 3) Educate administrative users about the risks of clicking on suspicious links or inputs. 4) Monitor web server logs for unusual requests targeting the vulnerable parameter. 5) Use web application firewalls (WAF) with rules designed to detect and block XSS payloads targeting the application. 6) Regularly back up data and have incident response plans ready in case of compromise. These targeted mitigations go beyond generic advice by focusing on the specific vulnerable parameter and administrative context.