CVE-2025-4420: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in themehunk Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce
The Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘containerWidth’ parameter in all versions up to, and including, 1.3.1 due to a missing capability check on the vayu_blocks_option_panel_callback() function and insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AI Analysis
Technical Summary
CVE-2025-4420 is a stored Cross-Site Scripting (XSS) vulnerability affecting the Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce plugin, versions up to and including 1.3.1. This vulnerability arises from improper neutralization of input during web page generation, specifically involving the 'containerWidth' parameter. The root cause is a missing capability check in the vayu_blocks_option_panel_callback() function combined with insufficient input sanitization and output escaping. As a result, authenticated attackers with Subscriber-level access or higher can inject arbitrary JavaScript code into pages generated by the plugin. When other users access these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, privilege escalation, or other malicious activities. The vulnerability has a CVSS v3.1 base score of 6.4, reflecting medium severity, with an attack vector of network (remote), low attack complexity, requiring privileges (authenticated user), no user interaction, and a scope change. The impact affects confidentiality and integrity but not availability. No known exploits are currently reported in the wild, and no official patches have been linked yet. The vulnerability is significant because WordPress is widely used, and the Gutenberg Blocks ecosystem is popular for site customization, making this plugin a common target. The ability for low-privilege users to inject persistent scripts increases the risk of exploitation in multi-user WordPress environments, such as membership sites or e-commerce platforms using WooCommerce.
Potential Impact
For European organizations using WordPress with the Vayu Blocks plugin, this vulnerability poses a risk of unauthorized script execution leading to data theft, session hijacking, or unauthorized actions performed on behalf of legitimate users. E-commerce sites using WooCommerce could see customer data compromised or fraudulent transactions initiated. The vulnerability's requirement for authenticated access limits exposure to environments where user registration or subscriber roles exist, but many European organizations operate community, membership, or customer portals where such roles are common. Exploitation could undermine user trust, violate GDPR requirements around data protection, and lead to reputational damage or regulatory penalties. Additionally, the scope change in the CVSS vector indicates that the vulnerability can affect resources beyond the initially compromised component, potentially allowing attackers to escalate privileges or access sensitive administrative functions. Given the widespread adoption of WordPress in Europe across sectors including government, education, and commerce, the impact could be broad if not mitigated promptly.
Mitigation Recommendations
European organizations should immediately audit their WordPress installations to identify the presence of the Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce plugin, especially versions up to 1.3.1. Until an official patch is released, organizations should consider disabling or removing the plugin to eliminate the attack surface. If removal is not feasible, restrict user roles to minimize Subscriber-level access or implement strict user registration controls and monitoring for suspicious activity. Employ Web Application Firewalls (WAFs) with custom rules to detect and block malicious payloads targeting the 'containerWidth' parameter. Additionally, implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Regularly review and sanitize user-generated content and monitor logs for unusual behavior. Organizations should also keep abreast of vendor updates and apply patches promptly once available. Conduct security awareness training for administrators and users about the risks of XSS and the importance of role-based access controls.
Affected Countries
Germany, France, United Kingdom, Netherlands, Italy, Spain, Poland, Sweden
CVE-2025-4420: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in themehunk Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce
Description
The Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘containerWidth’ parameter in all versions up to, and including, 1.3.1 due to a missing capability check on the vayu_blocks_option_panel_callback() function and insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AI-Powered Analysis
Technical Analysis
CVE-2025-4420 is a stored Cross-Site Scripting (XSS) vulnerability affecting the Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce plugin, versions up to and including 1.3.1. This vulnerability arises from improper neutralization of input during web page generation, specifically involving the 'containerWidth' parameter. The root cause is a missing capability check in the vayu_blocks_option_panel_callback() function combined with insufficient input sanitization and output escaping. As a result, authenticated attackers with Subscriber-level access or higher can inject arbitrary JavaScript code into pages generated by the plugin. When other users access these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, privilege escalation, or other malicious activities. The vulnerability has a CVSS v3.1 base score of 6.4, reflecting medium severity, with an attack vector of network (remote), low attack complexity, requiring privileges (authenticated user), no user interaction, and a scope change. The impact affects confidentiality and integrity but not availability. No known exploits are currently reported in the wild, and no official patches have been linked yet. The vulnerability is significant because WordPress is widely used, and the Gutenberg Blocks ecosystem is popular for site customization, making this plugin a common target. The ability for low-privilege users to inject persistent scripts increases the risk of exploitation in multi-user WordPress environments, such as membership sites or e-commerce platforms using WooCommerce.
Potential Impact
For European organizations using WordPress with the Vayu Blocks plugin, this vulnerability poses a risk of unauthorized script execution leading to data theft, session hijacking, or unauthorized actions performed on behalf of legitimate users. E-commerce sites using WooCommerce could see customer data compromised or fraudulent transactions initiated. The vulnerability's requirement for authenticated access limits exposure to environments where user registration or subscriber roles exist, but many European organizations operate community, membership, or customer portals where such roles are common. Exploitation could undermine user trust, violate GDPR requirements around data protection, and lead to reputational damage or regulatory penalties. Additionally, the scope change in the CVSS vector indicates that the vulnerability can affect resources beyond the initially compromised component, potentially allowing attackers to escalate privileges or access sensitive administrative functions. Given the widespread adoption of WordPress in Europe across sectors including government, education, and commerce, the impact could be broad if not mitigated promptly.
Mitigation Recommendations
European organizations should immediately audit their WordPress installations to identify the presence of the Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce plugin, especially versions up to 1.3.1. Until an official patch is released, organizations should consider disabling or removing the plugin to eliminate the attack surface. If removal is not feasible, restrict user roles to minimize Subscriber-level access or implement strict user registration controls and monitoring for suspicious activity. Employ Web Application Firewalls (WAFs) with custom rules to detect and block malicious payloads targeting the 'containerWidth' parameter. Additionally, implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Regularly review and sanitize user-generated content and monitor logs for unusual behavior. Organizations should also keep abreast of vendor updates and apply patches promptly once available. Conduct security awareness training for administrators and users about the risks of XSS and the importance of role-based access controls.
Affected Countries
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Technical Details
- Data Version
- 5.1
- Assigner Short Name
- Wordfence
- Date Reserved
- 2025-05-08T00:07:55.910Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 683ee1eb182aa0cae273963e
Added to database: 6/3/2025, 11:52:11 AM
Last enriched: 7/11/2025, 7:16:46 AM
Last updated: 8/4/2025, 4:44:01 PM
Views: 13
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