Overview
CVE-2025-63522 identifies a Reverse Tabnabbing vulnerability affecting FeehiCMS version 2.1.1. This vulnerability exists within the Comments Management functionality. While the CVSS score is currently N/A, Reverse Tabnabbing can pose a serious threat if exploited, potentially leading to phishing attacks and data theft. It’s crucial for FeehiCMS users to understand the risks and take necessary precautions.
Technical Details
Reverse Tabnabbing occurs when a malicious website, linked from a vulnerable page, gains partial control over the originating page through the window.opener JavaScript property. Specifically, when a user clicks on a link within the Comments Management section of FeehiCMS 2.1.1, a newly opened tab/window might be susceptible to having its window.opener object manipulated by the linked-to site. The malicious site can then redirect the original FeehiCMS page to a fake login page or other deceptive content, tricking the user into entering their credentials or other sensitive information.
This is especially dangerous as users often trust the original, now-redirected, page because they initiated the navigation from within the FeehiCMS application.
CVSS Analysis
Currently, the CVSS score for CVE-2025-63522 is listed as N/A. However, this does not diminish the potential risk. Reverse Tabnabbing attacks can be highly effective in social engineering. A CVSS score might be assigned later after further analysis of the exploitability and impact within the specific context of FeehiCMS. It is recommended to treat this vulnerability with caution despite the missing score.
Possible Impact
Successful exploitation of this Reverse Tabnabbing vulnerability could lead to:
- Credential Theft: Users may unknowingly enter their login credentials on a fake login page, giving attackers access to their FeehiCMS accounts.
- Data Breach: Attackers could gain access to sensitive data stored within the FeehiCMS installation.
- Malware Distribution: The redirected page could be used to distribute malware to unsuspecting users.
- Website Defacement: An attacker could potentially modify the original site after gaining admin privileges.
Mitigation or Patch Steps
While an official patch for FeehiCMS 2.1.1 may or may not be available, the following mitigation steps are recommended:
- Upgrade FeehiCMS: Check for newer versions of FeehiCMS that address this vulnerability. If available, upgrading is the best solution.
- Rel=”noopener” on Links: Add the
rel="noopener"attribute to all<a>tags that link to external websites, especially within the Comments Management section. This prevents the new tab from accessing thewindow.openerobject. This is the most common and effective solution. Example:<a href="https://example.com" rel="noopener">External Link</a> - JavaScript Mitigation (Less Recommended): Implement JavaScript code to explicitly nullify the
window.openerobject after opening a new tab. However, this method can be less reliable than usingrel="noopener". - User Awareness: Educate users about the risks of phishing attacks and the importance of verifying the URL of login pages.
- Web Application Firewall (WAF): Implement a WAF with rules to detect and block Reverse Tabnabbing attacks.
Important: Prioritize using rel="noopener" as the primary mitigation strategy.
