#VU57612 Stored cross-site scripting in Content Staging - CVE-2021-39356

Vulnerability identifier: #VU57612

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-39356

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Content Staging
Web applications / Modules and components for CMS

Vendor: Joakim Stenberg

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the several parameters that are echo’d out via the ~/templates/settings.php file. A remote authenticated attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Content Staging: 1.1 - 2.0.1

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External links
https://wordfence.com/vulnerability-advisories/#CVE-2021-39356
https://plugins.trac.wordpress.org/browser/content-staging/trunk/templates/settings.php
https://github.com/BigTiger2020/word-press/blob/main/Content%20Staging.md

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.