CVE-2025-48986: Revive Adserver Auth Bypass Vulnerability

CVE-2025-48986 Overview

CVE-2025-48986 is an authorization bypass vulnerability in Revive Adserver versions 5.5.2 and 6.0.1 and earlier. An authenticated attacker can modify the email address of other users without proper authorization checks. After changing a victim's email, the attacker triggers the forgot password functionality to receive a password reset link at an address they control. This chain results in full account takeover of arbitrary users, including administrative accounts. The flaw maps to [CWE-284: Improper Access Control] and carries network-based exploitability with low privileges required.

Critical Impact
Authenticated attackers can hijack any Revive Adserver account, including administrators, by modifying target email addresses and abusing password recovery.

Affected Products

Revive Adserver 5.5.2 and earlier
Revive Adserver 6.0.1 and earlier
Self-hosted Revive Adserver deployments exposed to authenticated users

Discovery Timeline

2025-11-20 - CVE-2025-48986 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-48986

Vulnerability Analysis

Revive Adserver is an open-source ad-serving platform used by publishers and advertisers to manage campaigns. The application supports multi-user environments where accounts often share access to the same instance. CVE-2025-48986 stems from missing authorization checks on the user profile update endpoint. An authenticated user can submit a request that updates the email address field associated with a different user's account. The application processes the change without verifying that the requester owns the target account or holds administrative privileges over it.

Once the victim's email is replaced with an attacker-controlled address, the attacker invokes the standard forgot password workflow. The reset token is delivered to the new email, allowing the attacker to set a new password and assume the victim's identity. The vulnerability impacts confidentiality, integrity, and availability of any account reachable by an authenticated session.

Root Cause

The root cause is broken access control on the account update functionality. The application accepts user identifier parameters from the client and applies the email change without validating that the authenticated session matches the target user or possesses the required role. This is a classic Insecure Direct Object Reference pattern within an authenticated workflow.

Attack Vector

The attack requires network access to the Revive Adserver web interface and valid credentials for any user account. The attacker sends a crafted profile update request referencing the victim's user identifier and supplying a controlled email address. Following the email change, the attacker requests a password reset for the victim's username and uses the received token to set new credentials. Technical details are available in the HackerOne Report #3398283.

Detection Methods for CVE-2025-48986

Indicators of Compromise

Unexpected email address changes in the users table or audit logs, especially when the modifying account does not match the modified account
Password reset requests immediately following profile updates from the same source IP
Login activity from new IP addresses or geographies for accounts that recently had their email changed
HTTP POST requests to user account update endpoints referencing user IDs that differ from the authenticated session

Detection Strategies

Audit web server access logs for profile update requests where the target user_id parameter does not match the session owner
Correlate email modification events with subsequent forgot-password submissions within short time windows
Alert on administrative account email changes initiated by non-administrative sessions

Monitoring Recommendations

Enable detailed application logging for all user profile modifications, including before-and-after values
Forward authentication and account management events to a centralized SIEM or data lake for correlation
Monitor for bulk enumeration of user_id values in update requests, which may indicate reconnaissance

How to Mitigate CVE-2025-48986

Immediate Actions Required

Upgrade Revive Adserver to a version newer than 5.5.2 and 6.0.1 that addresses CVE-2025-48986
Review user account email addresses and reset credentials for any accounts showing unexpected modifications
Restrict access to the Revive Adserver administrative interface to trusted networks where feasible
Invalidate all active sessions and force password resets after patching

Patch Information

Update to the latest fixed release of Revive Adserver published after the 5.5.2 and 6.0.1 branches. Consult the HackerOne Report #3398283 for vendor coordination details and confirm the release notes of the upgrade target reference CVE-2025-48986.

Workarounds

Limit Revive Adserver user accounts to the minimum required and disable inactive accounts to reduce the pool of authenticated attackers
Place the Revive Adserver instance behind a web application firewall and block requests that attempt to modify another user's profile fields
Enforce multi-factor authentication on email systems used for password recovery to reduce takeover impact

bash

# Configuration example: restrict admin interface access via reverse proxy
location /www/admin/ {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://revive_backend;
}