CVE-2021-39356 : The Content Staging WordPress plugin is vulnerable to Stored Cross-Site Scriptin

The Content Staging WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and escaping via several parameters that are echo'd out via the ~/templates/settings.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 2.0.1. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

Published 2021-10-21 20:15:08

Updated 2021-10-27 22:25:24

Source Wordfence

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2021-39356

Content Staging Project » Content Staging » For Wordpress
Versions up to, including, (<=) 2.0.1
cpe:2.3:a:content_staging_project:content_staging:*:*:*:*:*:wordpress:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-39356

EPSS FAQ

0.60%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 67 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-39356

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
3.5	LOW	AV:N/AC:M/Au:S/C:N/I:P/A:N	6.8	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: Single Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
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
Attack Vector: Network Attack Complexity: Low Privileges Required: High User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None
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
Attack Vector: Network Attack Complexity: Low Privileges Required: High User Interaction: None Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2021-39356

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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-2021-39356

https://wordfence.com/vulnerability-advisories/#CVE-2021-39356

Vulnerability Advisories - Wordfence
Third Party Advisory
https://github.com/BigTiger2020/word-press/blob/main/Content%20Staging.md

word-press/Content Staging.md at main · BigTiger2020/word-press · GitHub
Exploit;Third Party Advisory
https://plugins.trac.wordpress.org/browser/content-staging/trunk/templates/settings.php

settings.php in content-staging/trunk/templates – WordPress Plugin Repository
Third Party Advisory

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Vulnerability Details : CVE-2021-39356

Products affected by CVE-2021-39356

Exploit prediction scoring system (EPSS) score for CVE-2021-39356

CVSS scores for CVE-2021-39356

CWE ids for CVE-2021-39356

References for CVE-2021-39356