CVE-2026-78467 in Pro Plugin
Summary
by MITRE • 08/25/2026
The Fluent Support Pro plugin for WordPress is vulnerable to unauthorized access due to a missing capability check on a function in all versions up to, and including, 2.3.1. This makes it possible for authenticated attackers, with Subscriber-level access and above, to perform an unauthorized action.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/25/2026
The vulnerability identified within the Fluent Support Pro plugin for WordPress represents a critical failure in authorization logic that affects all versions up through 2.3.1. At its core, this flaw is classified as a missing function level access control issue, which aligns with CWE-862 from the Common Weakness Enumeration standard. This specific weakness occurs when an application fails to verify whether the executing user has sufficient privileges before allowing them to perform sensitive operations. In the context of WordPress plugins, such checks are typically implemented using capability verification functions that ensure only administrators or users with designated roles can execute administrative tasks. The absence of this check in Fluent Support Pro creates a significant security gap where the application relies solely on authentication rather than authorization to control access.
The operational impact of this vulnerability is substantial because it allows authenticated attackers who possess Subscriber-level access and above to perform unauthorized actions within the plugin's interface. In WordPress, even lower-tier roles like Subscribers are considered authenticated users since they must log in with valid credentials. By exploiting this missing capability check, these users can bypass intended restrictions and execute functions that should be reserved for higher-privileged accounts such as Administrators or Editors. This could potentially lead to unauthorized modifications of support tickets, manipulation of customer data, alteration of plugin settings, or other administrative actions depending on the specific function affected by the flaw. The ability for lower-level users to escalate their effective privileges through this mechanism undermines the principle of least privilege and compromises the integrity of the support system managed by the plugin.
From a threat modeling perspective, this vulnerability facilitates unauthorized access and potential data manipulation, which are key components in many attack scenarios documented under the MITRE ATT&CK framework for enterprise environments. Specifically, it relates to techniques involving account manipulation or permission escalation where an attacker leverages existing credentials to gain higher levels of access than originally intended. The risk is exacerbated by the widespread use of WordPress and its plugins in business-critical applications where support ticketing systems often contain sensitive customer information including personal identifiable data and private communication histories. An attacker exploiting this flaw could not only disrupt service availability but also exfiltrate confidential data or deface the application interface, leading to reputational damage and potential regulatory compliance issues for organizations relying on Fluent Support Pro.
To mitigate this vulnerability, immediate action is required by upgrading the plugin to a version later than 2.3.1 where the missing capability check has been addressed by the developers. Until an update is available or if patching is not immediately feasible, administrators should consider restricting access to WordPress installations running vulnerable versions of Fluent Support Pro through network-level controls such as IP whitelisting for administrative endpoints. Additionally implementing strict role-based access control policies and regularly auditing user permissions can help minimize the attack surface. Security monitoring tools should be configured to detect unusual activity patterns associated with lower-privileged users attempting to execute administrative functions, providing an additional layer of defense against exploitation attempts while ensuring that all software components are kept up to date with security patches released by vendors.