Vulnerability Details CVE-2021-39338
The MyBB Cross-Poster WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/classes/MyBBXPSettings.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 1.0. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 60.4%
CVSS Severity
CVSS v3 Score 5.5
CVSS v2 Score 2.1
References
- https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md
- https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338
- https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md
- https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338
Products affected by CVE-2021-39338
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cpe:2.3:a:mybb_cross-poster_project:mybb_cross-poster:-
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cpe:2.3:a:mybb_cross-poster_project:mybb_cross-poster:1.0