Overview
CVE-2025-55126 is a reported stored Cross-Site Scripting (XSS) vulnerability affecting the navigation box located at the top of advertiser-related pages. The vulnerability was discovered and reported by HackerOne community member Dang Hung Vi (vidang04). Specifically, the campaign names are the vector through which malicious JavaScript can be injected and stored.
Technical Details
The vulnerability stems from insufficient input sanitization when handling campaign names displayed in the advertiser navigation. An attacker could inject malicious JavaScript code within the campaign name. This code would then be stored on the server and executed in the browsers of other users accessing the same advertiser pages. Because the XSS is stored, every user who views the affected campaign will trigger the malicious payload, increasing the scope of the attack.
CVSS Analysis
Currently, no CVSS score is available for CVE-2025-55126. The severity is also listed as N/A. This likely indicates that the vulnerability is newly discovered and still being evaluated by the vendor. However, given the nature of stored XSS vulnerabilities, the potential impact could be significant.
Possible Impact
The impact of a stored XSS vulnerability can be significant. An attacker could potentially:
- Steal user session cookies, leading to account takeover.
- Deface the web page, injecting malicious content.
- Redirect users to phishing websites.
- Execute arbitrary JavaScript code in the user’s browser, potentially compromising their system.
- Gain administrative privileges if a vulnerable campaign name is viewed by an administrator.
Mitigation or Patch Steps
To mitigate this vulnerability, the following steps are recommended:
- Input Sanitization: Implement strict input sanitization on all user-supplied data, especially campaign names. Use appropriate encoding techniques (e.g., HTML encoding) to prevent the execution of malicious JavaScript code.
- Output Encoding: Encode all data displayed in the advertiser navigation to prevent XSS attacks.
- Content Security Policy (CSP): Implement a Content Security Policy to restrict the sources from which the browser is allowed to load resources, further limiting the impact of XSS attacks.
- Regular Security Audits: Conduct regular security audits and penetration testing to identify and address potential vulnerabilities.
- Stay Updated: Monitor the vendor’s security advisories and apply any available patches promptly.
