CVE-2025-2747: Kentico Xperience CMS Authentication Bypass Using an Alternate Path or Channel Vulnerability

CVE-2025-2747 is an authentication bypass vulnerability in Kentico Xperience CMS. It stems from an alternate path or channel that can let an unauthenticated attacker reach and control administrative objects. For organizations running this content management system, the issue matters because administrative control often includes site configuration, user management, content publishing, and other high-privilege functions that can lead to full site compromise if abused.

Defenders should treat this as a high-priority authentication flaw in a widely deployed CMS. Confirm all version, patch, and configuration details against the vendor advisory, as public technical specifics remain limited to the CWE classification and CISA description.

How it works

The vulnerability is classified as CWE-288: Authentication Bypass Using an Alternate Path or Channel. In this class of weakness, the application provides more than one way to reach a protected resource or function. An attacker who discovers or crafts a request that travels the alternate path can skip the normal authentication checks that would otherwise be enforced on the primary path.

According to the CISA summary, successful abuse of this flaw in Kentico Xperience CMS could allow an attacker to control administrative objects. That typically means the ability to create, modify, or delete privileged resources without first presenting valid credentials. Exact request paths, parameters, or conditions required for exploitation are not detailed in the available facts; teams must obtain those from the vendor advisory rather than relying on general descriptions of the CWE.

Am I affected? How to find it in your systems

Kentico Xperience CMS is commonly deployed as a web-facing content management platform on Windows or Linux servers, often behind IIS, reverse proxies, or cloud load balancers. It may also appear in hybrid or SaaS-hosted configurations. Inventory efforts should therefore focus on any server or container that hosts web content managed by Kentico.

• Search asset inventories, CMDB records, and software bill-of-materials for “Kentico,” “Xperience,” or related product identifiers.
• Examine web server configurations, application pools, and installed packages for Kentico binaries or modules.
• Review internal documentation and deployment pipelines for CMS instances used for marketing sites, portals, or intranet content.
• Compare installed versions and configurations against the list of affected builds published in the vendor advisory; do not assume any particular version is safe without that confirmation.

Telemetry that may indicate attempted or successful exploitation includes unexpected administrative actions, creation of new admin accounts, changes to security settings, or access to administrative endpoints from unusual source addresses or without corresponding successful login events. Correlate web access logs, application logs, and authentication logs for anomalies around administrative object manipulation. Because the flaw is an authentication bypass, traditional failed-login alerts may not fire.

How to remediate

The primary remediation is to apply the vendor-supplied update or mitigation exactly as described in the official advisory for CVE-2025-2747. CISA’s required action is to apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for any cloud-hosted instances, or discontinue use of the product if mitigations are unavailable.

After patching, verify that the alternate path is no longer reachable and that normal authentication is enforced for all administrative functions. Re-baseline configurations, rotate any credentials that may have been exposed, and confirm that administrative objects cannot be manipulated without proper authentication. For cloud deployments, ensure the service provider has applied the corresponding fix or that your tenant configuration follows the BOD 22-01 recommendations.

If you can't patch immediately

Until the vendor update can be applied, reduce exposure with layered compensating controls:

• Network segmentation: place the CMS behind a firewall or reverse proxy that restricts administrative interfaces to trusted management networks only.
• Virtual patching or WAF rules: implement temporary signatures that block requests matching the alternate path or anomalous administrative object access patterns; tune carefully to avoid false positives.
• Feature disablement: if the advisory identifies a specific module, endpoint, or configuration option that enables the bypass, disable it until the permanent fix is installed.
• Heightened monitoring: increase logging verbosity for authentication and administrative actions, forward logs to a SIEM, and alert on any unauthenticated access to privileged resources.
• Access restrictions: enforce multi-factor authentication and least-privilege accounts for remaining legitimate administrative users, and consider temporary IP allow-listing.

If no effective mitigation exists, CISA guidance includes discontinuing use of the product until a fix is available.

If your data may have been exposed

Authentication-bypass flaws that grant administrative control can lead to data exposure, content defacement, or further lateral movement. Although ransomware use of this specific CVE is not documented, any successful compromise should be treated as a potential breach. Review administrative audit trails, content change histories, and outbound network traffic for signs of unauthorized activity. Organizations can also run a free exposure scan of their email addresses against known breach data sets to determine whether credentials or personal information associated with the environment have already appeared in public dumps. Preserve forensic evidence and follow your incident-response plan if indicators of compromise are found.