CVE-2021-39338

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. 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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.3 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

2.1 /10

CVSS v2.0 : LOW

V2 Legend

Vector : AV:N/AC:H/Au:S/C:N/I:P/A:N

Exploitability : 3.9 / Impact : 2.9

Access Vector NETWORK

Access Complexity HIGH

Authentication SINGLE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References
Link Resource
https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md Exploit Third Party Advisory
https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php Patch Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338 Third Party Advisory
https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md Exploit Third Party Advisory
https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php Patch Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338 Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:mybb_cross-poster_project:mybb_cross-poster:*:*:*:*:*:wordpress:*:*
History

21 Nov 2024, 06:19

Type Values Removed Values Added
References () https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md - Exploit, Third Party Advisory () https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md - Exploit, Third Party Advisory
References () https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php - Patch, Third Party Advisory () https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php - Patch, Third Party Advisory
References () https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338 - Third Party Advisory () https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338 - Third Party Advisory
CVSS v2 : 2.1
v3 : 4.8 		v2 : 2.1
v3 : 5.5

20 Oct 2021, 15:38

Type Values Removed Values Added
CVSS v2 : unknown
v3 : 5.5 		v2 : 2.1
v3 : 4.8
CPE cpe:2.3:a:mybb_cross-poster_project:mybb_cross-poster:*:*:*:*:*:wordpress:*:*
References (MISC) https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md - (MISC) https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md - Exploit, Third Party Advisory
References (MISC) https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php - (MISC) https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php - Patch, Third Party Advisory
References (MISC) https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338 - (MISC) https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338 - Third Party Advisory

15 Oct 2021, 13:21

Type Values Removed Values Added
New CVE
Information

Published : 2021-10-15 13:15

Updated : 2024-11-21 06:19

NVD link : CVE-2021-39338

Mitre link : CVE-2021-39338

CVE.ORG link : CVE-2021-39338

JSON object : View

Products Affected

mybb_cross-poster_project

  • mybb_cross-poster
CWE
CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')