CVE-2026-1908 in Integration with Hubspot Forms Plugin
Summary
by MITRE • 03/21/2026
The Integration with Hubspot Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'hubspotform' shortcode in all versions up to, and including, 1.2.2 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 03/21/2026
The CVE-2026-1908 vulnerability affects the Integration with Hubspot Forms plugin for WordPress, specifically targeting versions up to and including 1.2.2. This represents a critical security flaw that enables stored cross-site scripting attacks through the plugin's 'hubspotform' shortcode implementation. The vulnerability stems from inadequate input sanitization and output escaping mechanisms that fail to properly validate or escape user-supplied attributes before processing them within the plugin's shortcode functionality.
The technical flaw manifests when authenticated attackers with Contributor-level access or higher exploit the insufficient validation controls to inject malicious JavaScript code through the hubspotform shortcode parameters. These injected scripts are then stored within the WordPress database and executed whenever any user accesses pages containing the compromised shortcode. This creates a persistent threat vector that can affect any user who views pages with the vulnerable shortcode, regardless of their role or permissions within the WordPress environment.
From an operational impact perspective, this vulnerability enables attackers to execute arbitrary web scripts in the context of affected websites, potentially leading to session hijacking, credential theft, data exfiltration, or further compromise of the WordPress installation. The stored nature of the XSS vulnerability means that the malicious code persists even after the initial injection, creating a long-term threat that can affect multiple users over time. Attackers can leverage this vulnerability to redirect users to malicious sites, steal cookies, or perform actions on behalf of authenticated users within the WordPress environment.
The vulnerability aligns with CWE-79, which describes Cross-Site Scripting flaws resulting from insufficient input validation and output escaping. This weakness enables attackers to inject malicious scripts that execute in the context of other users' browsers, making it particularly dangerous in multi-user environments like WordPress sites. The attack vector follows ATT&CK technique T1566.001, which involves phishing with malicious attachments or links, where the malicious script injection occurs through legitimate plugin functionality rather than external attachments.
Mitigation strategies should prioritize immediate plugin updates to versions that address the input sanitization and output escaping deficiencies. Administrators should implement strict role-based access controls to limit contributor-level access to trusted users only, while also monitoring for any suspicious shortcode usage or content modifications. Additionally, implementing Content Security Policy headers and regular security audits of plugin installations can provide additional defense layers. The most effective remediation involves applying the vendor's security patch or upgrading to a version that properly sanitizes all user-supplied attributes and escapes output before rendering within the hubspotform shortcode functionality.