CVE-2026-28099

Vulnerability

Overview

The UberSlider Ultra WordPress plugin (versions up to and including 2.3) contains a reflected cross-site scripting (XSS) vulnerability due to improper neutralization of user-supplied input during web page generation [1]. This flaw falls under CWE-79 and allows an attacker to inject arbitrary HTML and JavaScript into a page response.

Exploitation

Details

An unauthenticated attacker can exploit this vulnerability by crafting a malicious link containing a payload and tricking a user into clicking it [1]. No special privileges are required to initiate the attack, but successful exploitation requires the victim to interact with the crafted link, such as clicking or visiting a specially prepared page [1]. The reflected nature means the injected script executes in the context of the victim's browser session on the affected site.

Impact

If exploited, an attacker can execute arbitrary scripts in the victim's browser, leading to actions such as redirecting users to malicious sites, injecting advertisements, stealing session cookies, or defacing the website [1]. This type of vulnerability is frequently used in mass-exploit campaigns targeting thousands of WordPress sites regardless of their size or popularity [1].

Mitigation

As of the publication date, no official patch has been released for versions 2.3 and earlier [1]. The recommended immediate action is to update the plugin once a patched version becomes available [1]. If updating is not possible, users should contact their hosting provider or web developer for assistance [1]. Patchstack has issued a virtual mitigation rule that can block attacks until an official fix is tested and applied [1].