Executive Summary

CVE-2026-28099 is a medium severity Cross Site Scripting (XSS) vulnerability affecting the WordPress UberSlider Ultra Plugin versions up to and including 2.3.

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 pages.

It is classified under OWASP Top 10 A3: Injection and has a CVSS score of 7.1, indicating moderate danger with potential for exploitation.

Exploitation requires user interaction by a privileged user, such as clicking a malicious link, visiting a crafted page, or submitting a form, although no authentication is required to initiate the attack.

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Impact Analysis

This vulnerability can allow attackers to execute malicious scripts on your website, which can lead to unauthorized redirects, display of unwanted advertisements, or other harmful HTML payloads.

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

Since the attack requires user interaction but no authentication, any visitor or privileged user clicking a malicious link or visiting a crafted page could trigger the exploit.

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Compliance Impact

I don't know

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Detection Guidance

The vulnerability is a reflected Cross Site Scripting (XSS) issue in the UberSlider Ultra WordPress plugin up to version 2.3. Detection typically involves testing for injection of malicious scripts in web page inputs or URLs that the plugin processes.

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

Network monitoring tools can also be used to detect suspicious HTTP requests containing such payloads targeting the UberSlider Ultra plugin endpoints.

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Mitigation Strategies

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

Website owners should proactively implement this mitigation to prevent exploitation until an official patch is released.

Additionally, it is advisable to limit user interactions that could trigger the vulnerability, such as avoiding clicking suspicious links or visiting untrusted pages that might exploit the reflected XSS.

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