CVE-2026-78279 in Fluent Support Pro Plugin
Summary
by MITRE • 08/24/2026
Unauthenticated Cross Site Request Forgery (CSRF) in Fluent Support Pro <= 2.3.1 versions.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified as an unauthenticated Cross-Site Request Forgery within Fluent Support Pro versions up to and including 2.3.1 represents a critical security flaw that undermines the integrity of administrative actions performed through the WordPress plugin interface. This specific type of attack exploits the lack of proper state verification mechanisms in HTTP requests, allowing an attacker to trick authenticated administrators into performing unintended actions without their knowledge or consent. Unlike many other CSRF vulnerabilities that require the victim to be logged in and actively browsing a malicious site while having the target application open, this vulnerability is classified as unauthenticated because it targets endpoints that may not strictly enforce session validation for certain administrative operations, or more accurately, it exploits the fact that once an admin is authenticated on the WordPress dashboard, any subsequent request from a different origin can be forged if anti-CSRF tokens are missing or improperly validated. The core technical flaw lies in the absence of unique, secret per-user tokens within forms and AJAX requests that modify state, such as changing plugin settings, creating new support tickets with malicious configurations, or deleting existing data.
From an operational perspective, the impact of this vulnerability is severe due to the high privilege level typically associated with WordPress administrators who use Fluent Support Pro for managing customer interactions. An attacker can craft a simple HTML page containing hidden forms or JavaScript-driven requests that automatically submit actions to the vulnerable endpoints when visited by an administrator. This could lead to unauthorized changes in plugin configuration, potentially disabling security features, altering email notification settings to intercept sensitive support data, or creating backdoor user accounts with administrative privileges if such functionality exists within the affected version. Furthermore, attackers might manipulate ticket statuses or delete critical customer communication history, causing significant operational disruption and loss of trust between businesses and their clients. The ability to perform these actions without direct interaction from the victim makes this a high-risk vector for persistent compromise of the WordPress environment hosting the plugin.
This vulnerability aligns with CWE-352, which defines Cross-Site Request Forgery as an attack that forces an end user to execute unwanted actions on a web application in which they are currently authenticated. The lack of anti-CSRF tokens or improper validation of these tokens is the primary technical deficiency. In modern secure development practices, every state-changing request should require a unique token tied to the current session and validated server-side before execution. The absence of this mechanism violates fundamental principles outlined in OWASP guidelines for preventing CSRF attacks. Additionally, from an ATT&CK framework perspective, this falls under T1566.002, Phishing: Spearphishing Link, as attackers would typically distribute malicious links via email or other social engineering tactics to lure administrators into visiting the crafted page that triggers the forged requests.
To mitigate this vulnerability, immediate action is required by updating Fluent Support Pro to a version greater than 2.3.1 where these security controls have been implemented. Developers must ensure that all administrative endpoints enforce strict validation of anti-CSRF tokens generated per session and bound to specific user contexts. Implementing the SameSite cookie attribute for session cookies can also provide an additional layer of defense by restricting how browsers send cookies in cross-site requests, although this should not be relied upon as a sole mitigation strategy given varying browser support and potential bypass techniques. For organizations unable to update immediately due to compatibility constraints, implementing Web Application Firewall rules that monitor for anomalous request patterns or requiring manual confirmation steps for critical administrative actions can serve as temporary compensating controls until the patch is applied. Regular security audits and code reviews focusing on state-changing operations are essential to prevent similar flaws in future releases.