#VU10153 Cross-site scripting in WordPress and WP Mobile detector - CVE-2018-5776

Vulnerability identifier: #VU10153

Vulnerability risk: Low

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

CVE-ID: CVE-2018-5776

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WordPress
Web applications / CMS
WP Mobile detector
Web applications / Modules and components for CMS

Vendor: WordPress.ORG

Description

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

The vulnerability exists in flash fallback files within the MediaElement library used by WordPress due to insufficient sanitization of user-supplied data. A remote 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
Update to version 4.9.2.

Vulnerable software versions

WordPress: 3.7 - 3.7.24, 3.8 - 3.8.24, 3.9 - 3.9.22, 4.0 - 4.0.21, 4.1 - 4.1.21, 4.2 - 4.2.18, 4.3.0 - 4.3.14, 4.4 - 4.4.13, 4.5 - 4.5.12, 4.6 - 4.6.9, 4.7 - 4.7.8, 4.8 - 4.8.4, 4.9 - 4.9.1

WP Mobile detector: 3.7

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External links
https://wordpress.org/news/2018/01/wordpress-4-9-2-security-and-maintenance-release/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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