The vulnerability CVE-2025-64354 in Matias Ventura Gutenberg is a stored cross-site scripting (XSS) issue caused by improper neutralization of input during web page generation. It affects all versions up to 21.8.2. The CVSS 3.1 base score is 6.5, reflecting a medium severity with network attack vector, low attack complexity, requiring privileges and user interaction, and impacts on confidentiality, integrity, and availability. No patch or vendor advisory details are currently available, and the product is not a cloud service.

Successful exploitation could allow an attacker with low privileges and requiring user interaction to execute arbitrary scripts in the context of the affected application, potentially leading to limited confidentiality, integrity, and availability impacts. There are no known active exploits in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution with input handling and user privileges in the affected versions. Monitor vendor channels for updates.