CVE-2021-39338
CVSS V2 Low 2.1
CVSS V3 Medium 4.8
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.
Overview
- CVE ID
- CVE-2021-39338
- Assigner
- security@wordfence.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-10-15T13:15:07
- Last Modified Date
- 2021-10-20T15:38:57
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:mybb_cross-poster_project:mybb_cross-poster:*:*:*:*:*:wordpress:*:* | 1 | OR | 1.0 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:H/Au:S/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- HIGH
- Authentication
- SINGLE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 2.1
- Severity
- LOW
- Exploitability Score
- 3.9
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- HIGH
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality Impact
- LOW
- Availability Impact
- NONE
- Base Score
- 4.8
- Base Severity
- MEDIUM
- Exploitability Score
- 1.7
- Impact Score
- 2.7
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md | Exploit Third Party Advisory |
| https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338 | Third Party Advisory |
| https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php | Patch Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-39338 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39338 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:50:19 | Added to TrackCVE | |||
| 2022-12-05 12:28:34 | 2021-10-15T13:15Z | 2021-10-15T13:15:07 | CVE Published Date | updated |
| 2022-12-05 12:28:34 | 2021-10-20T15:38:57 | CVE Modified Date | updated | |
| 2022-12-05 12:28:34 | Analyzed | Vulnerability Status | updated |