WordPress Vulnerability Report: April 2021, Part 1

New WordPress plugin and vulnerabilities were disclosed during the first week of April. This post provides a report of recent WordPress plugin, theme, and core vulnerabilities and what to do if you run one of the vulnerable plugins or themes on your website.

The WordPress Vulnerability Roundup is divided into three different categories: WordPress core, WordPress plugins, and WordPress themes. Each vulnerability includes information on which version you should be running, so be sure to update!

Each vulnerability will also have a severity rating of Low, Medium, High, or Critical. The severity ratings are based on a Common Vulnerability Scoring System designed to help you know how to measure the severity of a vulnerability.

WordPress Core Vulnerabilities

The latest version of WordPress is currently 5.7. Make sure all your websites are running the latest version of WordPress core.

WordPress Plugin Vulnerabilities

This section covers vulnerabilities in WordPress plugins with instructions on whether to update or remove the vulnerable plugin.

1. Controlled Admin Access

Vulnerability: Improper Access Control to Privilege Escalation
Patched in Version: 1.5.6
Severity: High – CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

The vulnerability is patched, so you should update to version 1.5.6+.

2. Advanced Booking Calendar

Vulnerability: Authenticated Reflected Cross-Site Scripting
Patched in Version: 1.6.8
Severity: High – CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

The vulnerability is patched, so you should update to version 1.6.8+.

3. Cooked Pro

Vulnerability: Unauthenticated Reflected Cross-Site Scripting
Patched in Version: 1.7.5.6
Severity: Medium – CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

The vulnerability is patched, so you should update to version 1.7.5.6+.

4. SecuPress Free & Pro

Vulnerability: Unauthenticated Arbitrary IP Ban
Patched in Version: 2.0
Severity: Medium – CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

The vulnerability is patched, so you should update to version 2.0+.

5. Ivory Search

Vulnerability: Reflected Cross-Site Scripting
Patched in Version: 4.6.1
Severity: Medium – CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L

The vulnerability is patched, so you should update to version 4.6.1+.

6. Goto – Tour & Travel

Vulnerability: Unauthenticated Reflected Cross-Site Scripting
Patched in Version: 2.0
Severity: Medium – CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

The vulnerability is patched, so you should update to version 2.0+.

7. Virtual Robots.txt

Vulnerability: Authenticated Stored Cross-Site Scripting
Patched in Version: 1.10
Severity: Medium – CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

The vulnerability is patched, so you should update to version 1.10+.

8. Realteo

Vulnerability: Unauthenticated Reflected Cross-Site Scripting
Patched in Version: 1.2.4
Severity: High – CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

Vulnerability: Arbitrary Property Deletion via IDOR
Patched in Version: 1.2.4
Severity: High – CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

The vulnerability is patched, so you should update to version 1.2.4+.

9. Business Hours Pro

Vulnerability: Unauthenticated Arbitrary File Upload to RCE
Patched in Version: No known fix
Severity: Critical – CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

The vulnerability HAS NOT been patched, so you should remove this plugin immediately.

10. Erident Custom Login and Dashboard

Vulnerability: Authenticated Stored Cross-Site Scripting
Patched in Version: 3.5.9
Severity: Medium – CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

The vulnerability is patched, so you should update to version 3.5.9+.

11. Pie Register

Vulnerability: Reflected Cross-Site Scripting
Patched in Version: 3.7.0.1
Severity: High – CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

The vulnerability is patched, so you should update to version 3.7.0.1+.

12. Tutor LMS

Vulnerability: Authenticated Local File Inclusion
Patched in Version: 1.8.8
Severity: Medium – CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

The vulnerability is patched, so you should update to version 1.8.8+.

WordPress Theme Vulnerabilities

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Michael Moore

Each week, Michael puts together the WordPress Vulnerability Report to help keep your sites safe. As Product Manager at iThemes, he helps us continue to improve the iThemes product lineup. He’s a giant nerd & loves learning about all things tech, old & new. You can find Michael hanging out with his wife & daughter, reading or listening to music when not working.