CVE-2026-73789 in ClearPass Policy Manager
Summary
by MITRE • 09/09/2026
A vulnerability in the web-based management interface of CPPM guest account management services could allow an unauthenticated remote attacker to manipulate account settings. Successful exploitation could allow an attacker to extend network access beyond policy limits, leading to unauthorized prolonged use of network resources.
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Analysis
by VulDB Data Team • 09/09/2026
The identified security flaw resides within the web-based management interface specifically associated with ClearPass Policy Manager guest account services. This vulnerability stems from insufficient validation and authorization checks implemented in the backend logic that handles user profile modifications. Because the affected endpoint does not properly verify whether an unauthenticated or low-privilege session possesses the necessary administrative rights to alter critical configuration parameters, it creates a direct path for remote exploitation. The core technical deficiency is a broken access control mechanism where state-changing requests are processed without adequate authentication tokens or permission scopes being validated against the requesting user's actual privilege level. This allows an attacker who has network connectivity to the management interface to send crafted HTTP requests that bypass standard security gates, effectively treating unauthenticated traffic as if it originated from a privileged administrator account.
From an operational perspective, this vulnerability poses a severe risk to organizational infrastructure integrity and resource governance. Guest accounts are typically provisioned with strict time limits, bandwidth caps, or usage quotas defined by corporate policy to prevent abuse of network resources. By manipulating these settings remotely without authentication, an attacker can extend the validity period of guest credentials indefinitely or remove restrictive policies entirely. This leads directly to unauthorized prolonged use of network services, which not only violates compliance requirements but also consumes valuable bandwidth and processing power intended for legitimate users. In environments where guest access is a primary entry point for external entities, this flaw effectively neutralizes one of the most important perimeter security controls, allowing an attacker to maintain persistent connectivity under the guise of a standard guest session while evading detection mechanisms that rely on policy enforcement logs.
The implications extend beyond simple resource exhaustion. Persistent unauthorized network access can serve as a foothold for further lateral movement within the internal network if the guest VLAN is not properly segmented from critical assets. Attackers may leverage this extended access to conduct reconnaissance, attempt credential harvesting from other users sharing the same network segment, or deploy malicious payloads on connected devices. The lack of authentication required for exploitation means that any individual with basic knowledge of web application interaction and access to the management IP address can exploit this flaw without needing prior credentials, significantly lowering the barrier to entry for malicious actors. This aligns closely with CWE-287 Improper Authentication and CWE-862 Missing Authorization, as the system fails to verify identity before granting privileges and does not enforce role-based restrictions on sensitive configuration changes.
To mitigate this risk, immediate remediation should focus on patching the ClearPass Policy Manager software to the latest version released by Aruba Networks that addresses these specific access control flaws. Until patches are applied, network administrators must implement strict firewall rules to restrict access to the web management interface exclusively from trusted administrative IP ranges using VPN or dedicated out-of-band management networks. Additionally, enabling multi-factor authentication for all administrative accounts and ensuring that guest account policies enforce server-side validation of session tokens can help reduce exposure. Regular auditing of configuration changes and monitoring for anomalous modifications to guest profiles will also aid in early detection of exploitation attempts. Adhering to the principle of least privilege by disabling unnecessary management interfaces on production systems remains a critical defense-in-depth strategy against such vulnerabilities, which are often categorized under MITRE ATT&CK techniques related to Initial Access via Web Services and Defense Evasion through configuration manipulation.