CVE-2025-53349

Vulnerability

Overview

CVE-2025-53349 is a reflected cross-site scripting (XSS) vulnerability in the Laborator Kalium WordPress theme, affecting versions from n/a through 3.18.3. The root cause is improper neutralization of user-supplied input during web page generation, allowing an attacker to inject arbitrary HTML and JavaScript into a response page [1].

Exploitation

Details

An attacker can exploit this vulnerability by crafting a malicious link or form submission that, when clicked or submitted by a privileged user (e.g., an administrator), causes the injected script to execute in the context of the victim's browser. No authentication is required to trigger the attack, but successful exploitation depends on user interaction—the target must perform an action such as clicking a link or submitting a form [1].

Impact

Successful exploitation could allow an attacker to inject malicious scripts, including redirects, advertisements, or advertisements, and potentially steal session cookies or perform other actions on behalf of the victim. The vulnerability is considered moderately dangerous and is expected to be used in mass-exploit campaigns targeting thousands of websites regardless of size or traffic [1].

Mitigation

The vendor has released version 3.19 which resolves the vulnerability. Users are strongly advised to update immediately. If updating is not possible, a mitigation rule is available from Patchstack to block attacks until the update can be applied [1].