CVE-2026-25331 describes a DOM-based Cross-site Scripting vulnerability in the Melapress WP Activity Log WordPress plugin, affecting versions up to 5.5.4. The issue arises from improper input neutralization during web page generation, allowing malicious scripts to be executed in the user's browser. The CVSS 3.1 base score is 6.5, reflecting network attack vector, low attack complexity, requiring low privileges and user interaction, with a scope change and low impact on confidentiality, integrity, and availability.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the affected site, potentially leading to limited disclosure or modification of information and partial disruption of service. The impact is rated medium based on the CVSS score and the described effects on confidentiality, integrity, and availability.

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 plugin usage and limit privileges where possible. Monitor official Melapress channels for updates or patches addressing this vulnerability.