CVE-2025-69389 is a reflected Cross-site Scripting (XSS) vulnerability found in the Hugh Mungus Visitor Maps Extended Referer Field plugin, which is used to display visitor referer information on websites. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, specifically in the extended referer field feature. This flaw allows attackers to inject malicious JavaScript code into URLs that, when accessed by users, execute in their browsers within the context of the vulnerable site. The exploitation does not require authentication but does require the victim to click on a crafted link or visit a maliciously crafted page. The plugin versions up to and including 1.2.6 are affected, with no patches currently available. The vulnerability can lead to theft of session cookies, user credentials, or perform actions on behalf of the user, compromising confidentiality and integrity of user data. Although no known exploits are currently in the wild, the vulnerability is publicly disclosed and could be weaponized by attackers targeting websites using this plugin. The lack of input sanitization indicates a failure to properly encode or filter special characters in the referer field before rendering it in HTML, a common cause of reflected XSS. This vulnerability is particularly dangerous for websites with high user interaction or administrative access via browsers. The absence of a CVSS score necessitates an assessment based on impact and exploitability factors.

The primary impact of CVE-2025-69389 is the potential compromise of user confidentiality and integrity through the execution of arbitrary scripts in the context of the vulnerable website. Attackers can steal session cookies, enabling account hijacking, or perform unauthorized actions on behalf of users. This can lead to data breaches, unauthorized access, and reputational damage for affected organizations. The availability impact is generally low for reflected XSS but could be leveraged in combination with other vulnerabilities for more severe attacks. Since the vulnerability requires user interaction, the scope depends on the ability of attackers to lure users into clicking malicious links. Organizations running websites with the affected plugin, especially those with high traffic or sensitive user data, face increased risk. The absence of patches means the vulnerability remains exploitable, increasing the window of exposure. Additionally, attackers could use this vulnerability as a foothold for further attacks or phishing campaigns. Overall, the threat poses a significant risk to web application security and user trust.

1. Monitor official sources from Hugh Mungus for patches or updates addressing this vulnerability and apply them promptly once available. 2. Implement strict input validation and output encoding on the server side to sanitize the extended referer field, ensuring special characters are properly neutralized before rendering. 3. Deploy Content Security Policy (CSP) headers to restrict the execution of inline scripts and reduce the impact of XSS attacks. 4. Use Web Application Firewalls (WAFs) with rules designed to detect and block reflected XSS attack patterns targeting the referer field. 5. Educate users and administrators about the risks of clicking on suspicious links and encourage cautious browsing behavior. 6. Conduct regular security assessments and penetration testing focusing on web application input handling. 7. Consider temporarily disabling or replacing the vulnerable plugin with alternative solutions until a secure version is released. 8. Review and harden session management mechanisms to limit the impact of stolen session tokens.