CVE-2025-52670 is a vulnerability identified in Revive Adserver, an open-source ad serving platform widely used for managing and delivering online advertisements. The vulnerability exists in versions 5.5.2, 6.0.1, and earlier, where a missing authorization check allows authenticated users with limited privileges to delete banners owned by other accounts. This flaw arises because the system fails to verify whether the requesting user has the appropriate permissions to perform deletion actions on banners not owned by them. The vulnerability is exploitable remotely over the network (AV:N) with low attack complexity (AC:L), requiring only privileges of a normal user (PR:L) and no user interaction (UI:N). The scope is unchanged (S:U), meaning the impact is confined to the vulnerable component. The impact on confidentiality is none (C:N), but integrity is high (I:H) as unauthorized deletion compromises the integrity of advertising content, and availability impact is low (A:L) since the system remains operational but with partial data loss. No known exploits are currently reported in the wild, but the vulnerability's nature makes it a significant risk for organizations relying on Revive Adserver to manage advertising assets. The vulnerability was published on November 20, 2025, and assigned a CVSS v3.0 score of 7.1, reflecting its high severity. The lack of patch links suggests that fixes may be pending or not yet publicly available, emphasizing the need for immediate attention from administrators.

For European organizations, this vulnerability threatens the integrity of digital advertising campaigns managed via Revive Adserver. Unauthorized deletion of banners can disrupt marketing efforts, cause financial losses, and damage brand reputation. Organizations relying on Revive Adserver for revenue generation or client services may face operational disruptions and client dissatisfaction. The impact extends to advertising agencies, media companies, and any business using this platform to manage ad inventory. Since the vulnerability requires authenticated access, insider threats or compromised user accounts could be leveraged to exploit it. The absence of confidentiality impact limits data leakage concerns, but integrity and availability of advertising content are at risk. Given the widespread use of digital advertising in Europe, especially in countries with advanced digital economies, the threat could affect a broad range of sectors including retail, media, and e-commerce. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the potential for future exploitation.

1. Immediately audit user permissions within Revive Adserver to ensure users have the minimum necessary privileges, especially restricting banner deletion rights. 2. Monitor logs for unusual deletion activities or access patterns that could indicate exploitation attempts. 3. Apply any available patches or updates from the Revive project as soon as they are released. 4. If patches are not yet available, consider implementing compensating controls such as web application firewalls (WAF) rules to detect and block unauthorized deletion requests. 5. Enforce strong authentication mechanisms and consider multi-factor authentication (MFA) to reduce the risk of compromised accounts. 6. Regularly back up advertising data and configuration to enable quick recovery from unauthorized deletions. 7. Educate users about the risks of credential sharing and phishing to minimize insider threat vectors. 8. Engage with the Revive Adserver community or vendor for updates and recommended security practices.