Vulnerability Details : CVE-2021-39338
Potential exploit
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.
Vulnerability category: Cross site scripting (XSS)
Products affected by CVE-2021-39338
- cpe:2.3:a:mybb_cross-poster_project:mybb_cross-poster:*:*:*:*:*:wordpress:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-39338
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 29 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-39338
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
2.1
|
LOW | AV:N/AC:H/Au:S/C:N/I:P/A:N |
3.9
|
2.9
|
NIST | |
4.8
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
1.7
|
2.7
|
NIST | |
5.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N |
2.3
|
2.7
|
Wordfence |
CWE ids for CVE-2021-39338
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by: security@wordfence.com (Primary)
References for CVE-2021-39338
-
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338
Vulnerability Advisories - WordfenceThird Party Advisory
-
https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php
MyBBXPSettings.php in mybb-cross-poster/trunk/classes – WordPress Plugin RepositoryPatch;Third Party Advisory
-
https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md
word-press/MyBB Cross-Poster.md at main · BigTiger2020/word-press · GitHubExploit;Third Party Advisory
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