Unrated severityNVD Advisory· Published Oct 15, 2021· Updated Mar 31, 2025
MyBB Cross-Poster <= 1.0 Authenticated Stored Cross-Site Scripting
CVE-2021-39338
Description
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.
Affected products
1- Range: 1.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.mdmitrex_refsource_MISC
- plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.phpmitrex_refsource_MISC
- www.wordfence.com/vulnerability-advisories/mitrex_refsource_MISC
News mentions
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