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 an attacker can manipulate to inject malicious scripts. Since the attack vector is remote and does not require authentication (though the CVSS vector indicates a low privilege requirement), an attacker can exploit this flaw by crafting a specially crafted URL or request that includes malicious JavaScript code in the 'artmed' parameter. When an administrator or user with access to the affected page views the manipulated content, the injected script executes in their browser context. This can lead to session hijacking, defacement, or redirection to malicious sites. The CVSS 4.0 score of 5.1 (medium severity) reflects that the vulnerability is remotely exploitable with low attack complexity, no privileges required, but requires user interaction (the victim must visit the malicious link). The impact on confidentiality is none, integrity is low, and availability is none. No known exploits are currently in the wild, but the exploit has been publicly disclosed, increasing the risk of exploitation. No official patches or mitigations have been linked yet, indicating that affected users must rely on other defensive measures until a fix is released.

For European organizations using PHPGurukul Art Gallery Management System 1.1, this vulnerability poses a moderate risk primarily to administrative users who access the affected functionality. Successful exploitation could lead to session hijacking or unauthorized actions performed in the context of the victim’s session, potentially compromising sensitive administrative controls or data integrity within the art gallery management environment. While the direct impact on confidentiality and availability is limited, the integrity of administrative operations could be undermined, leading to potential data manipulation or unauthorized changes to art medium details. Additionally, if attackers leverage this vulnerability to deliver further malware or phishing payloads, the broader organizational security posture could be affected. Given the public disclosure and lack of patch, European organizations face an increased risk of targeted attacks, especially those with web-facing administrative portals. The requirement for user interaction means that phishing or social engineering campaigns could be used to lure administrators into triggering the exploit.

1. Immediate mitigation should include implementing strict input validation and output encoding on the 'artmed' parameter within /admin/edit-art-medium-detail.php to neutralize malicious scripts. 2. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context. 3. Restrict access to the administrative interface by IP whitelisting or VPN-only access to reduce exposure. 4. Educate administrative users about the risks of clicking on untrusted links and implement multi-factor authentication to reduce the impact of session hijacking. 5. Monitor web server logs for suspicious requests targeting the vulnerable parameter and deploy web application firewall (WAF) rules to detect and block XSS payloads targeting this endpoint. 6. Engage with the vendor or community to obtain or develop a patch and apply it promptly once available. 7. Regularly update and audit the web application and its dependencies to prevent similar vulnerabilities.