Question 1

What exactly is the wpDiscuz vulnerability?

Accepted Answer

What exactly is the wpDiscuz vulnerability?

The vulnerability is a stored cross-site scripting (XSS) issue that exists in wpDiscuz plugin versions up to and including 7.6.12. It allows authenticated users with admin privileges to inject arbitrary JavaScript code into pages. This malicious code then executes when the compromised page is viewed by users.

Question 2

How can this wpDiscuz vulnerability be exploited?

Accepted Answer

How can this wpDiscuz vulnerability be exploited?

The vulnerability can be exploited if an attacker gains admin access to a WordPress site using the wpDiscuz plugin. They can then inject malicious JavaScript code into pages and posts through insufficiently sanitized input fields. This code executes for any user that views the affected page or post. Attackers mainly use XSS to steal cookies and session data or hijack user accounts.

Question 3

What is the impact if my site is affected by this vulnerability?

Accepted Answer

What is the impact if my site is affected by this vulnerability?

The main impact is that attackers can potentially compromise user accounts, steal sensitive data, or deface your site through injected scripts. While unauthenticated users are not directly affected, they remain exposed when viewing pages containing the malicious code. Additionally, search engines may penalize affected sites for serving malicious content.

Question 4

How can I check if my WordPress site is vulnerable?

Accepted Answer

How can I check if my WordPress site is vulnerable?

You can check if your site is running a vulnerable wpDiscuz version by going to Plugins > Installed Plugins and looking at the version number. Any version up to and including 7.6.12 is affected. You can also review your site for unauthorized code that may indicate it was already compromised.

Question 5

Should I just remove wpDiscuz until a fix is available?

Accepted Answer

Should I just remove wpDiscuz until a fix is available?

Removing wpDiscuz is an option, but you will lose the plugin's functionality. Instead, you can downgrade to a previous version that is not affected, like 7.0.5. Otherwise, replace it temporarily with another commenting plugin until you can update.

Question 6

What steps should I take to fix and prevent this vulnerability?

Accepted Answer

What steps should I take to fix and prevent this vulnerability?

First, update wpDiscuz to version 7.6.13 or higher, which patches this vulnerability. Make sure auto-updates for plugins and themes are enabled. Limit admin access to trusted users. And implement a web application firewall as an added layer of protection.

Question 7

Is there any way to detect if my site was already attacked?

Accepted Answer

Is there any way to detect if my site was already attacked?

Watch for unfamiliar admin users or unexpected redirects/activity logs. Also scan your database, files, posts and code for injected scripts. A security plugin can scan for malicious code or anomalies indicating a compromise. If found, restore from a clean backup made before the attack.

Question 8

How long has this vulnerability existed?

Accepted Answer

How long has this vulnerability existed?

The stored XSS vulnerability existed in all wpDiscuz versions up to and including 7.6.12. It was publicly reported on November 17, 2022 meaning sites were potentially exposed for quite some time before a fix was issued.

Question 9

Should I switch from wpDiscuz to another plugin?

Accepted Answer

Should I switch from wpDiscuz to another plugin?

You don't necessarily need to replace wpDiscuz altogether now that a patch is available. But some users may opt to switch commenting plugins as an added precaution following this vulnerability. Popular alternatives include Disqus, Facebook Comments and Commento.

Question 10

What can I do to better protect my site going forward?

Accepted Answer

What can I do to better protect my site going forward?

Some best practices include keeping WordPress and all plugins/themes updated, limiting admin access, using strong passwords, implementing 2FA, performing regular backups and security scans, and using a web application firewall to help prevent future attacks.

CVSS 4.4

WordPress Plugin Vulnerability Report – wpDiscuz – Authenticated (Administrator+) Stored Cross-Site Scripting

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