Overview
CVE-2025-55123 describes a Cross-Site Scripting (XSS) vulnerability affecting Revive Adserver versions 5.5.2 and 6.0.1 and earlier. This vulnerability allows authenticated manager accounts within Revive Adserver to inject malicious JavaScript code into the accounts of their own advertiser users. This can lead to various security risks, including data theft, account takeover, and malware distribution.
Technical Details
The vulnerability stems from improper neutralization of user-supplied input within the Revive Adserver application. Specifically, manager accounts can craft malicious input (likely within fields related to advertiser details or campaign configurations) that is not properly sanitized before being displayed to advertiser users. This unsanitized input allows attackers to inject arbitrary JavaScript code that will execute within the context of the advertiser’s browser when they access the affected pages.
The specific injection point requires further investigation to pinpoint the exact affected field(s), but the HackerOne report indicates that the vulnerability allows a manager-level user to directly impact the advertiser users under their control. This suggests an issue with the way advertiser account information is handled and displayed within the manager’s interface.
CVSS Analysis
The CVSS score for CVE-2025-55123 is currently listed as N/A. This is likely because the vulnerability’s severity is dependent on the specific impact within a given Revive Adserver implementation. While the vulnerability is concerning, its exploitation is limited to authenticated users (manager accounts) targeting specific advertiser accounts under their control. Given the lack of information, estimating the CVSS score is impractical. Further analysis would be needed to accurately assess the Base Score.
Possible Impact
The exploitation of CVE-2025-55123 could lead to several negative consequences:
- Account Takeover: Malicious JavaScript could be used to steal advertiser account credentials, granting the manager attacker full control over the compromised advertiser account.
- Data Theft: Attackers could steal sensitive data from the advertiser’s account, such as campaign performance data, user information, and financial details.
- Malware Distribution: Injected JavaScript could redirect users to malicious websites or trigger the download of malware.
- Defacement: Injected code can be used to deface advertiser campaign materials.
Mitigation and Patch Steps
To mitigate the risk posed by CVE-2025-55123, it is highly recommended to:
- Upgrade Revive Adserver: Upgrade to the latest version of Revive Adserver as soon as a patch addressing this vulnerability is released. Check the official Revive Adserver website for updates and security advisories.
- Input Sanitization: Review all input fields where manager accounts can input data that is displayed to advertiser accounts. Implement robust input sanitization and output encoding to prevent XSS attacks. This includes escaping HTML entities, removing potentially malicious JavaScript code, and validating input against expected formats.
- Principle of Least Privilege: Limit the privileges granted to manager accounts to the minimum necessary to perform their duties. This reduces the potential impact if a manager account is compromised.
- Web Application Firewall (WAF): Implement a Web Application Firewall (WAF) to detect and block XSS attacks. Configure the WAF with rules to identify and block malicious JavaScript code being injected into the application.
