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Vulnerability DatabaseCVE-2021-39338
CVE-2021-39338:
WordPress vulnerability analysis and mitigation
Overview
The MyBB Cross-Poster WordPress plugin (versions up to and including 1.0) was identified with a Stored Cross-Site Scripting vulnerability (CVE-2021-39338). The vulnerability was discovered by the Thinkland Security Team and disclosed on August 20, 2021. This security issue affects WordPress installations where unfiltered_html is disabled for administrators and sites where unfiltered_html is disabled in multi-site configurations (CVE Mitre).
Technical details
The vulnerability stems from insufficient input validation and sanitization in the ~/classes/MyBBXPSettings.php file. It has been assigned a CVSS Score of 5.5 (Medium) with the vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N, indicating a network-accessible vulnerability requiring high privileges but no user interaction (Wordfence).
Impact
The vulnerability allows attackers with administrative user access to inject arbitrary web scripts into the application. This particularly impacts WordPress multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled (NVD).
Additional resources
Source: This report was generated using AI
Related WordPress vulnerabilities:
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