Advanced Custom Fields (ACF) – Authenticated (Contributor+) Stored Cross-Site Scripting via Custom Field – CVE-2023-6701 | WordPress Plugin Vulnerability Report
Plugin Name: Advanced Custom Fields (ACF)
Key Information:
- Software Type: Plugin
- Software Slug: advanced-custom-fields
- Software Status: Active
- Software Author: wpengine
- Software Downloads: 44,336,988
- Active Installs: 2,000,000
- Last Updated: January 25, 2024
- Patched Versions: 6.2.5
- Affected Versions: <= 6.2.4
Vulnerability Details:
- Name: Advanced Custom Fields <= 6.2.4
- Title: Authenticated (Contributor+) Stored Cross-Site Scripting via Custom Field
- Type: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CVE: CVE-2023-6701
- CVSS Score: 6.4
- Publicly Published: January 17, 2024
- Researcher: Francesco Carlucci
- Description: The Advanced Custom Fields plugin for WordPress, up to version 6.2.4, is susceptible to Stored Cross-Site Scripting (XSS) due to inadequate input sanitization and output escaping in a custom text field. This vulnerability allows authenticated attackers, with at least contributor-level access, to inject malicious scripts into pages, which will execute when a user accesses these pages.
Summary:
The Advanced Custom Fields plugin for WordPress has a vulnerability in versions up to and including 6.2.4 that allows authenticated Stored Cross-Site Scripting via a custom field. This vulnerability has been addressed and patched in version 6.2.5.
Detailed Overview:
This detailed analysis unveils a critical security flaw in the Advanced Custom Fields plugin, identified by researcher Francesco Carlucci. The vulnerability lies in the plugin’s handling of custom text fields, where insufficient measures for input sanitization and output escaping lead to the potential for Stored XSS attacks. This issue allows attackers with contributor-level access or higher to embed harmful web scripts into WordPress pages. The risks associated with this vulnerability are significant, as it could lead to unauthorized script execution, potentially compromising website integrity and user data. The developers have rectified this security gap in the recently released version 6.2.5.
Advice for Users:
- Immediate Action: Users are advised to update to the patched version 6.2.5 promptly.
- Check for Signs of Vulnerability: Monitor your website for unusual activities or unauthorized script executions.
- Alternate Plugins: While a patch is available, users may consider alternative field customization plugins as a temporary measure.
- Stay Updated: Regularly update all plugins to their latest versions to minimize the risk of vulnerabilities.
Conclusion:
The quick response by the Advanced Custom Fields plugin developers to patch this vulnerability underlines the critical nature of keeping software up-to-date. Users are encouraged to ensure that their installations are running version 6.2.5 or later to maintain the security of their WordPress sites.
References:
Introduction:
In today’s digital era, where websites stand as pivotal elements of online identity and commerce, maintaining robust cybersecurity is imperative. The recent discovery of a vulnerability in the widely used WordPress plugin, Advanced Custom Fields (ACF), serves as a critical reminder of the persistent cyber threats facing websites. CVE-2023-6701, the identifier for this vulnerability, highlights the importance of ongoing vigilance and the necessity of keeping website components updated for optimal security.
Plugin Overview:
Advanced Custom Fields (ACF), developed by wpengine, is an essential plugin for WordPress users, facilitating customization and enhancement of site content. With an impressive record of over 44 million downloads and 2 million active installations, ACF stands as a cornerstone in the WordPress community. However, its popularity also makes it a target for potential security vulnerabilities.
Risks and Potential Impacts:
The Stored Cross-Site Scripting vulnerability in ACF poses significant risks. Attackers can exploit this flaw to execute unauthorized scripts, potentially leading to data breaches, compromised user privacy, and undermining the integrity of the affected websites. The impact of such vulnerabilities can be especially severe for small businesses, where a single security breach can have far-reaching consequences on customer trust and business continuity.
Previous Vulnerabilities:
ACF has encountered 13 vulnerabilities since January 2013, illustrating the plugin’s exposure to ongoing security challenges and the importance of regular software updates as part of a comprehensive cybersecurity strategy.
Conclusion and Advice for Small Business Owners:
For small business owners managing WordPress sites, understanding and addressing such vulnerabilities is critical. While it might be challenging to stay constantly updated with every security development, neglecting this aspect can lead to significant security breaches. Employing automated tools for updates, setting regular reminders, or considering managed WordPress hosting services can be effective in ensuring the security of your site with minimal effort. Remember, proactive security practices are not just about protecting your website; they are about safeguarding your business’s online presence, reputation, and trustworthiness.
In conclusion, the CVE-2023-6701 vulnerability in ACF is a stark reminder of the ever-present cyber threats and the necessity of maintaining up-to-date security measures. By staying informed and acting promptly, website owners can significantly mitigate the risks posed by such vulnerabilities, ensuring a secure and resilient online presence.
Staying Secure
Staying on top of WordPress security can feel overwhelming for small business owners without dedicated IT staff. At Your WP Guy, we exist to shoulder that burden for you. Our WordPress experts can fully audit, secure, maintain and support your site – so you can focus on growing your business with peace of mind.
Don’t tackle security risks alone. Let us help you assess any impact from this vulnerability, update your plugins, and implement ongoing maintenance to avoid future threats. We treat your website like it’s our own – because we know how critical it is for reaching your customers.
Get in touch for a free consultation today on making WordPress security stress-free. Call 678-995-5169 or book a call here. Our knowledgeable team is ready to help you safeguard your online presence.
Advanced Custom Fields (ACF) – Authenticated (Contributor+) Stored Cross-Site Scripting via Custom Field – CVE-2023-6701 | WordPress Plugin Vulnerability Report FAQs
What is CVE-2023-6701 in the context of the Advanced Custom Fields plugin?
What is CVE-2023-6701 in the context of the Advanced Custom Fields plugin?
CVE-2023-6701 refers to a specific security vulnerability discovered in the Advanced Custom Fields (ACF) plugin for WordPress. This issue is classified as a Stored Cross-Site Scripting (XSS) vulnerability and affects versions of the plugin up to and including 6.2.4. The vulnerability arises due to inadequate sanitization and escaping of user inputs in custom fields, which could allow attackers with contributor-level access or higher to inject malicious scripts into web pages.
These malicious scripts, once embedded, can be executed in the browsers of anyone accessing the affected pages. This could potentially lead to unauthorized access to sensitive data, manipulation of web page content, or redirection to harmful sites, posing a significant risk to website security and user safety.
How do I know if my WordPress site is affected by this vulnerability?
How do I know if my WordPress site is affected by this vulnerability?
Your WordPress site is affected by this vulnerability if you are using a version of the Advanced Custom Fields plugin that is 6.2.4 or older. To check your plugin version, log into your WordPress dashboard, go to the ‘Plugins’ section, and find the Advanced Custom Fields plugin in the list. The version number is typically listed alongside the plugin’s name.
If your version is 6.2.4 or lower, it’s crucial to update the plugin immediately to the patched version to mitigate the risk. Regularly monitoring your website for unusual activities can also help detect if your site has been compromised.
What steps should I take to update the Advanced Custom Fields plugin?
What steps should I take to update the Advanced Custom Fields plugin?
Updating the Advanced Custom Fields plugin is straightforward and critical for maintaining your site’s security. First, log into your WordPress dashboard and navigate to the ‘Plugins’ section. Locate the Advanced Custom Fields plugin and check if an update is available. If there is, you will see an ‘Update Now’ link or button. Click this to initiate the update process, which WordPress will handle automatically.
After updating, ensure that your website is functioning correctly by reviewing its features and content. Regular backups of your site can provide a safety net in case any issues arise post-update.
Can this vulnerability affect other plugins or themes on my WordPress site?
Can this vulnerability affect other plugins or themes on my WordPress site?
While CVE-2023-6701 is specific to the Advanced Custom Fields plugin, it does not directly affect other plugins or themes. However, any security vulnerability within a WordPress site can have indirect effects, such as weakening the overall security or enabling attackers to leverage the vulnerability to exploit other weaknesses in the site.
It’s important to maintain all plugins and themes updated to their latest versions. Regular updates often include security patches that address known vulnerabilities and help keep your entire WordPress installation secure.
What should I do if I suspect my website has been compromised due to this vulnerability?
What should I do if I suspect my website has been compromised due to this vulnerability?
If you suspect that your website has been compromised as a result of this vulnerability, the first step is to update the Advanced Custom Fields plugin to the latest version to close off the security gap. Next, conduct a thorough review of your website, looking for any unauthorized changes or unusual activities, particularly in areas where custom fields are used.
In case of a confirmed breach, it’s advisable to consult with a cybersecurity professional who can assist in securing your site, cleaning up any malicious code, and taking steps to prevent future attacks. Utilizing a recent backup to restore your site to a pre-attack state can also be a viable solution.
What are the consequences of not updating the Advanced Custom Fields plugin?
What are the consequences of not updating the Advanced Custom Fields plugin?
Failing to update the Advanced Custom Fields plugin leaves your WordPress site vulnerable to the CVE-2023-6701 security flaw. This vulnerability can be exploited by attackers to execute malicious scripts on your site, potentially leading to data breaches, unauthorized access, or distribution of malware to your site’s visitors.
The consequences can be serious, ranging from loss of sensitive information to damage to your site’s reputation and possible legal repercussions, especially if customer data is compromised. Therefore, it is critical to update the plugin as soon as possible to protect against these risks.
Are there any alternative plugins I can use instead of Advanced Custom Fields?
Are there any alternative plugins I can use instead of Advanced Custom Fields?
Yes, there are alternative plugins available for custom field management in WordPress. Some popular options include ‘Custom Field Suite,’ ‘Toolset Types,’ and ‘Pods.’ These plugins offer similar functionalities for customizing and managing extra content fields in WordPress.
However, switching plugins should be a considered decision, as each plugin has its unique features and configuration requirements. Additionally, all plugins have potential vulnerabilities, so regular updates and security checks remain essential, regardless of which plugin you choose.
How often should I check for updates on my WordPress plugins and themes?
How often should I check for updates on my WordPress plugins and themes?
It is recommended to check for updates on your WordPress plugins and themes at least weekly. Updates not only provide new features and improvements but, more importantly, include security patches that protect your site from known vulnerabilities.
Many WordPress users opt for managed hosting services that automatically update plugins and themes, or use WordPress management tools to facilitate this process. Staying on top of updates is a key component of maintaining a secure WordPress site.
Can updating the Advanced Custom Fields plugin cause issues with my website?
Can updating the Advanced Custom Fields plugin cause issues with my website?
Updating plugins, including Advanced Custom Fields, is generally safe and is highly recommended for security reasons. However, in rare cases, updates can cause compatibility issues with other plugins, themes, or specific configurations of your WordPress site.
To minimize risks, consider testing updates on a staging site first, if possible, and always ensure that you have a recent backup of your site before applying any updates. If issues arise post-update, you can revert to your backup and investigate the cause of the problem.
What are best practices for maintaining the security of a WordPress site?
What are best practices for maintaining the security of a WordPress site?
Maintaining the security of a WordPress site involves several key practices: regularly updating plugins, themes, and the WordPress core; using strong passwords and implementing two-factor authentication; choosing reputable hosting; and employing security plugins for monitoring and protection. It’s also vital to regularly back up your site so you can restore it in the event of an attack.
Staying informed about the latest security threats and trends is equally important. Following WordPress security blogs, subscribing to security newsletters, and participating in WordPress communities can help you stay updated with minimal effort. A proactive approach to website security can significantly reduce the risk of vulnerabilities and cyber attacks.