CVE-2025-53342

Root

Cause The vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the GoodLayers Modernize WordPress theme, versions through 3.4.0. The application fails to properly neutralize user-supplied input when generating web pages, making it possible for an authenticated attacker with sufficient privileges to inject arbitrary JavaScript or HTML payloads that are permanently stored on the server [1].

Exploitation

Exploitation requires a privileged user (such as an editor or administrator) to submit crafted input via the theme's settings or content fields. The stored payload then executes in the browsers of other administrators or regular visitors when they access the affected page. No direct unauthenticated attack vector is described, but the stored nature of the payload means a single injection can affect many users [1].

Impact

A successful attack can lead to arbitrary script execution in the context of the vulnerable site. This can be abused to steal session cookies, redirect visitors to malicious domains, display deceptive advertisements, or deface the website. The advisory notes that vulnerabilities of this type are frequently used in mass-exploit campaigns targeting large numbers of WordPress installations regardless of site popularity or traffic [1].

Mitigation

The Modernize theme has not received a security update and is considered end-of-life. The recommended action is to remove and replace the theme entirely, as simply deactivating it does not remove the security risk unless a specific mitigation rule (e.g., from Patchstack) is deployed. If immediate replacement is not possible, consulting a hosting provider or web developer for alternative protective measures is advised [1].