Description

WordPress Plugin Related Posts is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. WordPress Plugin Related Posts version 5.12.91 is vulnerable; prior versions may also be affected.

Remediation

Edit the source code to ensure that input is properly sanitised or disable the plugin until a fix is available

References

https://www.pluginvulnerabilities.com/2019/03/30/wordpress-plugin-team-paints-target-on-exploitable-settings-change-vulnerability-that-permits-persistent-xss-in-related-posts/

https://blog.sucuri.net/2019/04/attacks-on-closed-wordpress-plugins.html

https://stackoverflow.com/questions/55610548/vulnerability-in-closed-plugin-yuzo-related-posts

https://www.wordfence.com/blog/2019/04/yuzo-related-posts-zero-day-vulnerability-exploited-in-the-wild/

Related Vulnerabilities

MySQL CVE-2015-2576 Vulnerability (CVE-2015-2576)

WordPress Plugin CP Contact Form with PayPal Cross-Site Scripting (1.2.97)

WordPress Plugin Profile Extra Fields by BestWebSoft Cross-Site Scripting (1.0.7)

Vanilla Forums Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2011-3812)

WordPress Plugin InstaWP Connect-1-click WP Staging & Migration Arbitrary File Upload (0.1.0.38)

Severity

High

Classification

CVE-2019-11869 CWE-79 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Tags

Missing Update XSS