CVE-2023-4774: 
WordPress vulnerability analysis and mitigation

The WP-Matomo Integration (WP-Piwik) plugin for WordPress contains a Stored Cross-Site Scripting vulnerability (CVE-2023-4774) discovered in versions up to and including 1.0.28. The vulnerability was disclosed on September 22, 2023, affecting the 'wp-piwik' shortcode functionality (NVD).

The vulnerability stems from insufficient input sanitization and output escaping on user-supplied attributes in the 'wp-piwik' shortcode. The issue has been assigned a CVSS v3.1 Base Score of 5.4 (Medium) by NIST with vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, while Wordfence assessed it at 6.4 (Medium) with vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N (NVD).

When exploited, this vulnerability allows authenticated attackers with contributor-level permissions or higher to inject arbitrary web scripts into pages. These malicious scripts will execute whenever a user accesses an affected page, potentially compromising user data and website security (NVD).

Users should update to a version newer than 1.0.28 of the WP-Matomo Integration plugin. The vulnerability has been patched in subsequent releases (WordPress Plugin).