CVE-2026-84789 in Firewall Analyzer
Summary
by MITRE • 09/23/2026
ZohoCorp ManageEngine OpManager and Firewall Analyzer versions 12.8.710 and below were vulnerable to a Broken Access Control vulnerability that allowed an authenticated low-privilege user to create alert notifications for firewalls outside their assigned scope.
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Analysis
by VulDB Data Team • 09/23/2026
The identified security flaw resides within ZohoCorp ManageEngine OpManager and Firewall Analyzer software, specifically affecting versions 12.8.710 and earlier releases. This vulnerability is classified as a Broken Access Control issue, which represents one of the most critical categories of web application vulnerabilities according to industry standards such as CWE-269 Improper Privilege Management and CWE-862 Missing Authorization. The core technical deficiency lies in the server-side validation logic governing alert notification creation for firewall devices. When an authenticated user initiates a request to create or modify an alert rule, the application fails to adequately verify whether the target firewall device falls within the administrative scope assigned to that specific user account. This oversight allows the system to process and persist configuration changes intended for restricted resources without enforcing the necessary boundary checks between user roles and resource ownership.
From an operational perspective, this flaw enables a low-privilege authenticated attacker to escalate their effective influence over the network infrastructure beyond what is permitted by their role definition. By crafting specific API requests or manipulating form submissions during alert creation, the malicious actor can specify firewall identifiers that are not associated with their authorized domain. The application accepts these inputs and updates its internal database accordingly, effectively granting the low-privilege user control over security policies for devices they should not be able to access. This breach of isolation undermines the principle of least privilege, which is fundamental to robust identity and access management frameworks such as NIST SP 800-53 AC-6 Least Privilege. The ability to alter alert configurations on unauthorized firewalls can lead to significant operational disruptions, including false positive alerts that distract security operations centers or silence critical warnings for high-value assets under the attacker's indirect control.
The impact of this vulnerability extends beyond mere configuration changes; it facilitates a form of lateral movement within the management plane. An adversary who compromises a low-privilege account can leverage this flaw to manipulate monitoring and alerting mechanisms across multiple network segments, potentially masking their own malicious activities or causing denial-of-service conditions through excessive alert generation on critical infrastructure. This behavior aligns with ATT&CK technique T1078 Valid Accounts, where attackers use legitimate credentials to maintain persistence and expand access within a compromised environment. Furthermore, the manipulation of security alerts can be seen as an attempt to undermine the integrity of the monitoring system itself, which is crucial for threat detection and incident response capabilities.
To mitigate this risk, organizations running affected versions must immediately apply the vendor-provided patches that address these authorization checks in subsequent releases. Until patching is feasible, administrators should implement strict network segmentation to limit access to the management interface from untrusted networks and enforce multi-factor authentication to reduce the likelihood of credential compromise. Additionally, reviewing user roles and permissions within OpManager and Firewall Analyzer can help identify accounts with excessive privileges that could be exploited via this vector. Regular audits of alert configurations and firewall assignments against documented authorization matrices are recommended to detect any unauthorized changes resulting from potential exploitation of this flaw.