CVE-2025-11828: 
WordPress vulnerability analysis and mitigation

The Magazine Companion plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability identified as CVE-2025-11828, discovered on November 10, 2025. The vulnerability affects all versions up to and including 1.2.3 of the plugin. This security issue exists in the 'headerHtmlTag' attribute within the bnm-blocks/featured-posts-1 block functionality (NVD).

The vulnerability stems from insufficient input sanitization and output escaping when handling user-supplied values as HTML tag names, specifically in the 'headerHtmlTag' attribute of the bnm-blocks/featured-posts-1 block. The issue has been assigned a CVSS v3.1 base score of 6.4 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. The vulnerability is classified as CWE-79: Improper Neutralization of Input During Web Page Generation (NVD, Wordfence).

When exploited, this vulnerability allows authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages. These malicious scripts will execute whenever any user accesses the compromised page, potentially leading to unauthorized data access or manipulation of user sessions (NVD).

The vulnerability has been addressed in version 1.2.4 of the Magazine Companion plugin by implementing proper validation of tag names in the headerHtmlTag and titleHtmlTag attributes. Users are advised to update to version 1.2.4 or later to protect against this vulnerability (WordPress Plugin).