High-Severity Stored XSS Vulnerability in HAX CMS (CVE-2026-48527)

CVE-2026-48527 is a stored cross-site scripting (XSS) vulnerability in HAX CMS, affecting versions up to 26.0.0. The vulnerability exists in the `/system/api/saveNode` endpoint, where authenticated users with page editing permissions can bypass the HTML sanitizer. This allows them to inject malicious JavaScript that can execute in the browsers of users viewing the affected pages. The potential impact includes session hijacking, credential harvesting, and unauthorized actions on behalf of other users. Patches are available for Node.js and PHP versions of HAX CMS, specifically 26.0.1 and 26.0.2, respectively. As of now, there are no reports of active exploitation or public proof-of-concept exploits. Cybersecurity professionals consider this vulnerability an immediate threat requiring urgent mitigation. The CVSS base score assigned is 8.7, indicating high severity.

Key Points: • CVE-2026-48527 is a high-severity stored XSS vulnerability in HAX CMS. • Authenticated users can exploit the vulnerability to inject malicious scripts. • Patches are available, and immediate action is recommended for affected users.