CVE-2026-57397 in Coaching Plugin
Summary
by MITRE • 07/23/2026
Unauthenticated Cross Site Scripting (XSS) in Coaching <= 3.9.2 versions.
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Analysis
by VulDB Data Team • 07/23/2026
The Coaching plugin for WordPress represents a critical security vulnerability through an unauthenticated cross site scripting flaw that affects versions 3.9.2 and earlier. This vulnerability exists within the plugin's handling of user input parameters, specifically in how it processes and renders data without adequate sanitization or validation mechanisms. The flaw allows malicious actors to inject arbitrary javascript code into web pages viewed by unsuspecting users, creating a persistent threat vector that can be exploited across multiple user sessions.
The technical implementation of this vulnerability stems from insufficient input validation within the plugin's core functionality where user-supplied data enters the application without proper escaping or encoding before being rendered in web output. Attackers can craft malicious payloads that exploit this weakness by submitting specially formatted parameters through various entry points within the plugin's interface. The vulnerability manifests when the application fails to properly sanitize user-controllable input fields, allowing javascript code to execute within the context of a victim's browser session.
From an operational standpoint, this unauthenticated XSS vulnerability poses significant risks to both end users and system administrators. An attacker can leverage this flaw to steal session cookies, perform actions on behalf of authenticated users, redirect victims to malicious websites, or harvest sensitive information from user interactions. The impact extends beyond simple data theft as the vulnerability can be used to establish persistent backdoors within compromised systems, especially when combined with other exploitation techniques. The unauthenticated nature means that no prior access or credentials are required to exploit this vulnerability, making it particularly dangerous in publicly accessible environments.
The attack surface for this vulnerability aligns with common exploitation patterns documented in the ATT&CK framework under the initial access and persistence phases, specifically targeting web application vulnerabilities. This weakness maps directly to CWE-79 which defines cross site scripting as a critical software security flaw that allows attackers to inject client-side scripts into web applications. Organizations running affected versions of the Coaching plugin face immediate risk of compromise, as the vulnerability can be exploited through simple GET or POST requests without requiring authentication or administrative privileges.
Mitigation strategies should include immediate patching to version 3.9.3 or later where the XSS vulnerability has been addressed through proper input validation and output encoding mechanisms. System administrators should implement comprehensive monitoring for suspicious user activity patterns that may indicate exploitation attempts, while also deploying web application firewalls to detect and block malicious payloads. Additional protective measures include implementing content security policies to limit script execution, regular security audits of installed plugins, and maintaining updated vulnerability scanning procedures to identify similar weaknesses in other components of the web application stack. The remediation process should also involve comprehensive user education regarding the dangers of clicking untrusted links or visiting compromised websites that may contain malicious javascript payloads designed specifically to exploit such vulnerabilities.