CVE-2026-105870 in Associate Post R2 Plugin
Summary
by MITRE • 10/09/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Delight Star Inc. WP Associate Post R2 wp-associate-post-r2 allows Reflected XSS.This issue affects WP Associate Post R2: from n/a through 5.0.1.
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Analysis
by VulDB Data Team • 10/09/2026
The identified security flaw represents a classic instance of Cross-site Scripting, specifically categorized under the Common Weakness Enumeration as CWE-79 Improper Neutralization of Input During Web Page Generation. This vulnerability exists within the WP Associate Post R2 plugin developed by Delight Star Inc., affecting versions ranging from its initial release up through version 5.0.1. The core technical deficiency lies in the application's failure to adequately sanitize or validate user-supplied input before incorporating it into dynamically generated web pages. In a typical web architecture, this means that data entered by users is reflected back in the response without proper encoding, allowing malicious scripts to execute within the context of the victim's browser session.
From an operational perspective, this Reflected Cross-site Scripting vulnerability allows attackers to inject executable JavaScript code into HTTP responses through manipulated URLs or form submissions. When a user interacts with a crafted link containing the malicious payload, their browser renders the page and executes the embedded script as if it originated from the trusted web server. This mechanism bypasses standard security controls such as the Same Origin Policy because the browser trusts the domain hosting the vulnerable plugin. The attack vector is relatively straightforward to exploit, requiring only social engineering or a targeted link delivery method rather than complex authentication bypass techniques, making it accessible even to attackers with limited technical expertise.
The impact of this vulnerability extends beyond simple script execution and can lead to severe security compromises depending on the privileges of the affected user. Attackers can steal session cookies, which may allow them to hijack active sessions and impersonate legitimate users or administrators. Furthermore, the injected scripts can perform actions on behalf of the victim, such as changing account settings, posting malicious content, or redirecting the user to phishing sites designed to harvest credentials. In environments where administrative accounts are targeted, the consequences can escalate to full site compromise, data exfiltration, and defacement, significantly damaging organizational reputation and integrity.
In terms of threat modeling and adversary behavior, this vulnerability aligns with MITRE ATT&CK techniques related to Client-side Injection and Web Session Manipulation. Specifically, it facilitates the initial access phase by leveraging trusted websites to deliver malicious payloads, a tactic often employed in spear-phishing campaigns or drive-by download scenarios where users are tricked into clicking compromised links. The persistence of this risk is heightened if the plugin remains installed on WordPress sites that handle sensitive user data or serve as portals for internal corporate communications.
To mitigate these risks, immediate action is required to update the WP Associate Post R2 plugin to a version newer than 5.0.1 where the input validation issues have been resolved by the vendor. For organizations unable to upgrade immediately due to compatibility constraints, implementing Web Application Firewall rules can provide temporary protection by detecting and blocking common XSS payloads in HTTP requests. Additionally, developers should ensure that all future integrations adhere to strict output encoding standards, such as HTML entity encoding for context-specific data insertion, and utilize Content Security Policy headers to restrict the execution of unauthorized scripts. Regular security audits and penetration testing are recommended to identify similar input handling deficiencies across other plugins and custom code within the WordPress ecosystem.