SB2021081810 - Multiple vulnerabilities in Custom Post Type Relations plugin for WordPress

Description

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2021-34654)

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 the "cptr[name]" parameter in the ~/pages/admin-page.php file. 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.

2) Cross-site scripting (CVE-ID: CVE-2021-34655)

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 the "cptr[name]" parameter in the ~/pages/admin-page.php file. 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.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34654
• https://plugins.trac.wordpress.org/browser/custom-post-type-relations/trunk/pages/admin-page.php#L60
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34655
• https://plugins.trac.wordpress.org/browser/wp-songbook/tags/2.0.11/inc/class.ajax.php#L21