CVE-2026-44958 Overview
CVE-2026-44958 is a broken access control vulnerability in Revive Adserver 6.0.6 and earlier. The flaw allows an authenticated advertiser-level user to activate or deactivate a banner without holding the required permission. The banner-edit.php script overwrites the banner status field based solely on banner edit permissions, ignoring whether the user is authorized to change activation state. The issue is tracked under CWE-284: Improper Access Control.
Critical Impact
Authenticated low-privilege advertiser accounts can toggle the active/inactive status of banners they can edit, undermining campaign integrity and ad delivery controls.
Affected Products
- Revive Adserver 6.0.6
- Revive Adserver versions earlier than 6.0.6
- Web-facing deployments exposing banner-edit.php to advertiser accounts
Discovery Timeline
- 2026-06-23 - CVE-2026-44958 published to NVD
- 2026-06-23 - Last updated in NVD database
- Public technical reference: HackerOne Report #3678828
Technical Details for CVE-2026-44958
Vulnerability Analysis
Revive Adserver uses a role-based permission model where advertiser-level users can be granted granular rights over banners and campaigns. The banner-edit.php script renders an edit form that includes the banner activation status field as a hidden HTML form input. When the form is submitted, the application writes the submitted status value to the banner record if the user holds banner edit permissions.
The permission check does not verify whether the user is authorized to change banner activation state specifically. An advertiser with only edit rights can therefore manipulate the hidden status parameter in the POST request and toggle banners between active and inactive states. This is a server-side authorization gap, not merely a client-side concern, because the backend honors the submitted value without re-validating the action.
The attacker requires a valid authenticated session at the advertiser level. Exploitation does not require user interaction from an administrator and is performed over the network through the standard web interface.
Root Cause
The root cause is missing fine-grained authorization on the banner status field. The application conflates "edit banner" with "change banner activation status," granting both capabilities to any user holding the edit permission. The hidden form field design propagated state to the client and trusted it on return, without an authorization check tied to the status mutation itself.
Attack Vector
An authenticated advertiser submits a crafted POST request to banner-edit.php with a modified status parameter. The server applies the change and persists the new activation state. The vendor remediation removes the status field from the hidden form fields in the banner edit screen, eliminating the submission path that the server previously trusted.
No verified public exploit code is available. See the HackerOne Report #3678828 for additional technical context.
Detection Methods for CVE-2026-44958
Indicators of Compromise
- Unexpected toggling of banner status values in Revive Adserver audit logs, especially changes performed by advertiser-tier accounts.
- POST requests to banner-edit.php from advertiser sessions containing a status parameter.
- Banners reactivated outside of scheduled campaign windows or after manual administrator deactivation.
Detection Strategies
- Review database audit trails on the banners table for status mutations correlated with low-privilege session IDs.
- Inspect web server access logs for POST requests to banner-edit.php and compare submitted form fields against the authenticated user's permission set.
- Alert on banner state transitions that occur immediately after an advertiser-level login event.
Monitoring Recommendations
- Enable verbose application logging in Revive Adserver to capture form parameters submitted to administrative endpoints.
- Forward web server, application, and database logs to a centralized analytics platform and build queries that join authentication events with banner mutation events.
- Periodically reconcile the banner status field against the expected campaign schedule to detect unauthorized activations.
How to Mitigate CVE-2026-44958
Immediate Actions Required
- Upgrade Revive Adserver to a version later than 6.0.6 where the status field has been removed from the banner edit hidden form fields.
- Audit existing advertiser accounts and revoke unnecessary banner edit permissions.
- Review banner activation state across all campaigns and reset any banners that show unexpected status changes.
Patch Information
The vendor fix removes the status field from the hidden form fields rendered by banner-edit.php, so the activation state can no longer be overwritten through the banner edit submission flow. Apply the upstream Revive Adserver release that includes this change. Refer to the HackerOne Report #3678828 for the linked advisory and commit references.
Workarounds
- Restrict advertiser-level accounts from accessing banner-edit.php via web server rules or a reverse proxy until the patch is applied.
- Implement a web application firewall rule that strips or rejects the status parameter on POST requests to banner-edit.php from non-administrator sessions.
- Place Revive Adserver administrative paths behind network-level access controls limited to trusted operator IP ranges.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
