CVE-2026-28073 in WP eMember Plugin
Summary
by MITRE • 03/19/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Tips and Tricks HQ WP eMember allows Reflected XSS.This issue affects WP eMember: from n/a through v10.2.2.
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Analysis
by VulDB Data Team • 03/19/2026
This vulnerability represents a classic cross-site scripting flaw that specifically impacts the WP eMember plugin for WordPress systems. The issue manifests as improper neutralization of input during web page generation, creating a pathway for malicious actors to inject arbitrary scripts into web pages viewed by other users. The vulnerability is classified as reflected XSS, meaning that the malicious script is reflected off the web server to the victim's browser, typically through parameters in the HTTP request. This type of vulnerability falls under CWE-79 which specifically addresses Cross-site Scripting flaws in web applications. The attack occurs when user-supplied input is not properly sanitized or escaped before being rendered in web pages, allowing attackers to execute malicious scripts in the context of the victim's browser session.
The technical implementation of this vulnerability allows attackers to exploit the input validation mechanisms within the WP eMember plugin. When users interact with the plugin's web interface or submit data through forms, the application fails to adequately sanitize the input parameters before incorporating them into dynamically generated HTML content. This creates an environment where malicious payloads can be injected through URL parameters, form fields, or other user-controllable inputs. The reflected nature of the vulnerability means that the malicious script must be crafted to be included in a URL or form submission, which is then reflected back to the user's browser when the page is rendered. The vulnerability affects all versions of the plugin from the initial release through version 10.2.2, indicating a long-standing issue that was not properly addressed in the codebase.
The operational impact of this vulnerability extends beyond simple script execution, potentially allowing attackers to hijack user sessions, steal sensitive information, or manipulate the functionality of the affected WordPress site. An attacker could craft malicious URLs that, when clicked by authenticated users, would execute scripts to steal cookies, session tokens, or other sensitive data. The reflected nature of the XSS means that the attack vector is typically delivered through social engineering techniques, where users are tricked into clicking malicious links. This vulnerability could also enable more sophisticated attacks such as credential theft, data exfiltration, or even privilege escalation if the affected users have administrative privileges. The impact is particularly concerning for WordPress sites using WP eMember for membership management, as these sites often contain sensitive user information and administrative controls.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and output encoding mechanisms throughout the application. The recommended approach involves sanitizing all user-supplied input before processing or rendering it in web pages, with particular emphasis on escaping HTML, JavaScript, and URL encoding where appropriate. Organizations should immediately upgrade to the latest version of the WP eMember plugin where this vulnerability has been patched, as the vendor has likely implemented proper input validation and output encoding measures. Additionally, implementing Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be loaded. Network monitoring and intrusion detection systems should be configured to detect suspicious patterns in traffic that might indicate attempts to exploit this vulnerability, while also following ATT&CK framework techniques for detecting and preventing web application attacks. Regular security assessments and code reviews should be conducted to identify similar input validation issues in other components of the web application stack.