CVE-2025-39578 describes a stored cross-site scripting vulnerability in CyberChimps Responsive Blocks (responsive-block-editor-addons) up to version 2.0.2. The issue is due to improper neutralization of input during web page generation, which allows attackers to inject and store malicious scripts that execute when other users view the affected content. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) indicates network attack vector, low attack complexity, requiring low privileges and user interaction, with a scope change and partial impact on confidentiality, integrity, and availability. No patch or official remediation information is provided in the available data.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of users viewing the affected web pages, potentially leading to partial disclosure of information, modification of content, and disruption of availability. The impact is rated medium severity with partial confidentiality, integrity, and availability impacts. There are no known active exploits reported at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider limiting privileges for users who can input content and apply web application firewall (WAF) rules to detect and block XSS payloads. Monitor vendor channels for updates and apply patches promptly once released.