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Vulnerability DatabaseCVE-2021-39343

CVE-2021-39343: 
WordPress vulnerability analysis and mitigation

Overview

The MPL-Publisher WordPress plugin (versions up to 1.30.2) was identified with a Stored Cross-Site Scripting vulnerability (CVE-2021-39343). The vulnerability was discovered and disclosed in October 2021, affecting multi-site installations where unfilteredhtml is disabled for administrators, and sites where unfilteredhtml is disabled (NVD).

Technical details

The vulnerability exists due to insufficient input validation and sanitization in several parameters within the ~/libs/PublisherController.php file. The vulnerability has been assigned a CVSS v3.1 base score of 4.8 (MEDIUM) by NIST with vector CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N, while Wordfence assessed it at 5.5 (MEDIUM) with vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N (NVD).

Impact

The vulnerability allows attackers with administrative user access to inject arbitrary web scripts into the affected WordPress sites. This particularly impacts multi-site installations and sites where unfiltered_html functionality is disabled (NVD).

Mitigation and workarounds

Users should upgrade their MPL-Publisher plugin to a version newer than 1.30.2 to address this vulnerability (Wordfence Advisory).

Additional resources

Source: This report was generated using AI

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