Overview
A reflected Cross-Site Scripting (XSS) vulnerability, identified as CVE-2025-48987, has been discovered in Revive Adserver versions 5.5.2 and 6.0.1 and earlier. This vulnerability stems from improper neutralization of user-supplied input, potentially allowing attackers to inject malicious scripts into the application and execute them in the context of a user’s browser. This can lead to session hijacking, sensitive data theft, or defacement of the ad server interface.
Technical Details
The vulnerability arises from the application’s failure to properly sanitize user input before reflecting it back in the response. An attacker can craft a malicious URL or inject a script into a vulnerable parameter. When a user clicks on this manipulated link, the injected script is executed in their browser within the security context of the Revive Adserver application. This allows the attacker to potentially perform actions on behalf of the user.
The specific vulnerable parameter is detailed in the HackerOne report referenced below.
CVSS Analysis
Currently, the CVSS score for CVE-2025-48987 is N/A. This may be because the vulnerability is newly reported and the CVSS score is still being calculated. It’s recommended to monitor the NIST National Vulnerability Database for updates.
However, given the nature of reflected XSS vulnerabilities, the severity is likely to be at least Medium, and potentially High depending on the specific attack vector and impact.
Possible Impact
Successful exploitation of this XSS vulnerability could have several serious consequences:
- Account Takeover: An attacker could steal a user’s session cookie and gain unauthorized access to their account.
- Data Theft: Sensitive information, such as user credentials, advertising campaign data, and server configuration details, could be compromised.
- Malware Distribution: An attacker could inject malicious scripts that redirect users to phishing sites or distribute malware.
- Defacement: The attacker can modify the web page content and deface the Revive Adserver interface, affecting users who access the platform.
Mitigation and Patch Steps
To mitigate the risk posed by CVE-2025-48987, users of Revive Adserver are strongly advised to take the following steps:
- Upgrade Immediately: Upgrade to the latest patched version of Revive Adserver as soon as it becomes available. Check the official Revive Adserver website (https://www.revive-adserver.com/) for updates and security advisories.
- Input Validation: Implement robust input validation and sanitization measures to prevent malicious scripts from being injected into the application.
- Output Encoding: Use proper output encoding techniques to ensure that user-supplied data is rendered safely in the browser.
- Web Application Firewall (WAF): Consider deploying a Web Application Firewall (WAF) to detect and block XSS attacks.
- Regular Security Audits: Perform regular security audits and penetration testing to identify and address potential vulnerabilities in your Revive Adserver installation.
