CVE-2026-50743: Revive Adserver CSRF Vulnerability

CVE-2026-50743 Overview

CVE-2026-50743 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] in the zone-include.php script of Revive Adserver 6.0.7. The script processes GET and POST requests that link or unlink banners and campaigns to advertising zones without validating a CSRF token. An attacker who lures an authenticated administrator to a crafted page can trigger these actions on the administrator's behalf. Successful exploitation modifies ad delivery configuration and can disrupt campaign integrity or redirect traffic to attacker-controlled banners.

Critical Impact
An attacker can silently link or unlink banners and campaigns to zones by tricking an authenticated Revive Adserver administrator into visiting a malicious page, tampering with ad delivery without any credential compromise.

Affected Products

Revive Adserver 6.0.7
zone-include.php administrative script
Deployments exposing the Revive administrative interface to authenticated administrators using standard browsers

Discovery Timeline

2026-07-20 - CVE-2026-50743 published to NVD
2026-07-23 - Last updated in NVD database

Technical Details for CVE-2026-50743

Vulnerability Analysis

The vulnerability resides in the zone-include.php administrative endpoint of Revive Adserver 6.0.7. This script controls the linking and unlinking of banners and campaigns to publisher zones, a core function of ad delivery configuration. The endpoint accepts state-changing GET and POST requests without validating an anti-CSRF token bound to the authenticated administrator session.

The issue is a classic Cross-Site Request Forgery weakness classified under [CWE-352]. Because the browser automatically attaches session cookies to any request targeting the Revive Adserver origin, a request originating from an attacker-controlled page executes with the administrator's privileges. The impact is limited to integrity and availability of ad delivery configuration and does not directly expose stored data.

Root Cause

The root cause is missing CSRF token verification on the zone-include.php handler. The script relies solely on session authentication to authorize sensitive state changes. It does not compare a submitted token against a value stored server-side for the current session, nor does it enforce SameSite constraints on the session cookie sufficient to block cross-origin form submissions.

Attack Vector

Exploitation requires an authenticated Revive Adserver administrator to visit or render attacker-controlled content while their session is active. The attacker crafts an HTML page containing an auto-submitting form or an <img> tag pointing at zone-include.php with parameters that link or unlink specific banners or campaigns to a target zone. When the browser issues the request, the session cookie is attached automatically and the server processes the action as legitimate administrative activity. No user interaction beyond visiting the page is required for GET-based variants.

See the HackerOne Security Report #3781691 for the reporter's technical details.

Detection Methods for CVE-2026-50743

Indicators of Compromise

Requests to zone-include.php with an HTTP Referer header pointing to an external or unexpected origin.
Zone-to-banner or zone-to-campaign link changes recorded in Revive audit logs outside of scheduled administrative activity.
Administrator sessions issuing state-changing requests immediately after loading unrelated third-party pages in the same browser.

Detection Strategies

Inspect web server access logs for POST and GET requests to zone-include.php where the Referer header does not match the Revive Adserver hostname.
Correlate administrative account activity in Revive with browser navigation events to identify state changes lacking a preceding legitimate admin UI page load.
Alert on high-frequency link or unlink operations against zones that historically see infrequent configuration changes.

Monitoring Recommendations

Enable and centralize Revive Adserver application audit logs and forward them to a SIEM for correlation with web proxy telemetry.
Monitor for unusual Origin or Referer values on all administrative endpoints, not just zone-include.php.
Track banner and campaign-to-zone mappings over time and flag unauthorized deltas for review.

How to Mitigate CVE-2026-50743

Immediate Actions Required

Restrict access to the Revive Adserver administrative interface using network controls, VPN, or IP allowlisting until a patched version is deployed.
Instruct administrators to use a dedicated browser or browser profile for Revive administration and to log out immediately after use.
Review recent zone, banner, and campaign link changes and revert any unauthorized modifications.

Patch Information

No vendor patch reference is included in the NVD entry at the time of publication. Monitor the HackerOne Security Report #3781691 and official Revive Adserver release channels for a fixed version addressing the missing CSRF token validation in zone-include.php.

Workarounds

Configure the session cookie with SameSite=Strict at the application or reverse proxy layer to block cross-site request submissions carrying credentials.
Deploy a Web Application Firewall (WAF) rule that rejects requests to zone-include.php when the Referer or Origin header does not match the Revive Adserver hostname.
Enforce short administrative session lifetimes to reduce the window during which a CSRF payload can succeed.

bash

# Example nginx snippet enforcing same-origin Referer on the vulnerable endpoint
location = /www/admin/zone-include.php {
    valid_referers server_names;
    if ($invalid_referer) { return 403; }
    proxy_pass http://revive_backend;
}