#VU19142 Stored Cross-site scripting in Yoast SEO


Published: 2019-07-11

Vulnerability identifier: #VU19142

Vulnerability risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-13478

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Yoast SEO
Web applications / Modules and components for CMS

Vendor: Joost de Valk

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 "/admin/taxonomy/class-taxonomy.php" script. A remote authenticated attacker can post a specially crafted message with XSS payload 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

Yoast SEO: 7.0 - 11.5


External links
http://github.com/Yoast/wordpress-seo/releases/tag/11.6-RC5


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. However, proof of concept for this vulnerability is available.


Latest bulletins with this vulnerability