Vulnerability identifier: #VU27440

Vulnerability risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-11025

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WordPress
Web applications / CMS

Vendor: WordPress.ORG

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 Customizer. A remote authenticated attacker can trick the victim to follow a specially crafted link 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
Install updates from vendor's website.

Vulnerable software versions

WordPress: 4.4 - 4.4.21, 4.3 - 4.3.22, 4.2 - 4.2.26, 4.1 - 4.1.29, 4.0 - 4.0.29, 3.9 - 3.9.30, 3.8 - 3.8.32, 3.7 - 3.7.32, 5.4, 5.3 - 5.3.2, 4.5 - 4.5.20, 4.6 - 4.6.17, 4.7 - 4.7.16, 4.8 - 4.8.12, 4.9 - 4.9.13, 5.0 - 5.0.8, 5.1 - 5.1.4, 5.2 - 5.2.5

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External links
http://wordpress.org/news/2020/04/wordpress-5-4-1/
http://wpvulndb.com/vulnerabilities/10203/
http://core.trac.wordpress.org/changeset/47633/
http://www.wordfence.com/blog/2020/04/unpacking-the-7-vulnerabilities-fixed-in-todays-wordpress-5-4-1-security-update/
http://github.com/WordPress/wordpress-develop/security/advisories/GHSA-4mhg-j6fx-5g3c

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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.