Executive Summary

CVE-2026-28109 is a medium severity Cross Site Scripting (XSS) vulnerability affecting the WordPress LambertGroup - AllInOne - Content Slider Plugin versions up to and including 3.8.

This vulnerability allows an attacker to inject malicious scripts—such as redirects, advertisements, or other HTML payloads—into a website, which execute when visitors access the compromised site.

It is classified under OWASP Top 10 A3: Injection and has a CVSS score of 7.1, indicating moderate risk.

Exploitation requires user interaction by a privileged user, such as clicking a malicious link, visiting a crafted page, or submitting a form, although the initial attack vector can be initiated by an unauthenticated user.

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Impact Analysis

This vulnerability can impact you by allowing attackers to execute malicious scripts on your website, which can lead to unauthorized redirects, display of unwanted advertisements, or execution of harmful HTML payloads.

Such attacks can compromise the integrity and trustworthiness of your website, potentially harming your users and damaging your reputation.

Since exploitation requires user interaction, attackers may trick privileged users into triggering the malicious scripts, increasing the risk of successful attacks.

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Compliance Impact

I don't know

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Detection Guidance

CVE-2026-28109 is a reflected Cross Site Scripting (XSS) vulnerability affecting the LambertGroup AllInOne Content Slider Plugin for WordPress up to version 3.8. Detection typically involves testing for injection of malicious scripts via input fields or URL parameters that the plugin processes.

While no specific detection commands are provided, common approaches include using web vulnerability scanners or manual testing by injecting typical XSS payloads (e.g., <script>alert(1)</script>) into input fields or URL parameters related to the plugin and observing if the script executes.

Network or system administrators can also monitor HTTP requests for suspicious parameters or payloads targeting the plugin endpoints.

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Mitigation Strategies

Since no official patch is currently available for CVE-2026-28109, immediate mitigation involves applying the mitigation rule issued by Patchstack to block attacks targeting this vulnerability.

Patchstack recommends implementing automated vulnerability mitigation services they offer to protect affected websites until an official fix is released and tested.

Additionally, administrators should limit user interaction with untrusted sources, avoid clicking suspicious links, and monitor for unusual activity related to the plugin.

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