Stored XSS in Yoast SEO plugin for WordPress

Published: 2019-07-11 | Updated: 2019-07-11
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-13478
CWE ID CWE-79
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software Yoast SEO Subscribe
Vendor Joost de Valk

Security Advisory

This security advisory describes one low risk vulnerability.

1) Stored Cross-site scripting

Severity: Low

CVSSv3: 5.8 [CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-13478

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

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, 7.0.1, 7.0.2, 7.0.3, 7.1, 7.2, 7.3, 7.4, 7.4.1, 7.4.2, 7.5, 7.5.1, 7.5.3, 7.6, 7.6.1, 7.7, 7.7.1, 7.7.2, 7.7.3, 7.8, 7.9, 7.9.1, 8.0, 8.1, 8.1.1, 8.1.2, 8.2, 8.2.1, 8.3, 8.4, 9.0, 9.0.1, 9.0.2, 9.0.3, 9.1, 9.2, 9.2.1, 9.3, 9.4, 9.5, 9.6, 9.7, 11.1, 11.1.1, 11.2, 11.2.1, 11.3, 11.4, 11.5

CPE External links

https://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.



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