CVE-2025-1437 Overview
CVE-2025-1437 is a stored Cross-Site Scripting (XSS) vulnerability in the Advanced iFrame plugin for WordPress, developed by tinywebgallery. The flaw affects all plugin versions up to and including 2025.2 and stems from insufficient input sanitization and output escaping on user-supplied attributes passed to the advanced_iframe shortcode. Authenticated users with contributor-level access or above can inject arbitrary JavaScript into pages. The injected scripts execute in the browser of any visitor who loads the affected page. The issue was partially addressed in version 2024.5 and improved in version 2025.3.
Critical Impact
Contributor-level attackers can inject persistent JavaScript that executes against site visitors and administrators, enabling session theft, account takeover, and content manipulation.
Affected Products
- Advanced iFrame plugin for WordPress, all versions up to and including 2025.2
- Partial fix introduced in version 2024.5
- Full fix available in version 2025.3
Discovery Timeline
- 2025-03-26 - CVE-2025-1437 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in the NVD database
Technical Details for CVE-2025-1437
Vulnerability Analysis
The vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation. The Advanced iFrame plugin exposes an advanced_iframe shortcode that accepts multiple attributes controlling how an embedded iframe is rendered. These attribute values are echoed into the resulting HTML without adequate sanitization or contextual output escaping.
Because WordPress contributors can author posts containing shortcodes, an attacker with only contributor privileges can plant malicious payloads in draft or published content. When an administrator, editor, or site visitor loads the page, the payload executes in their browser session. The user interaction requirement is satisfied by any user simply viewing the page containing the malicious shortcode. The scope-changed impact reflects that scripts execute in the browser of a different security principal than the attacker.
Root Cause
The plugin fails to apply WordPress escaping helpers such as esc_attr() or esc_html() to shortcode attribute values before emitting them into the HTML response. Attributes intended for iframe configuration are treated as trusted strings, allowing HTML and JavaScript syntax to break out of the attribute context.
Attack Vector
Exploitation requires an authenticated account with contributor-level access or higher. The attacker creates or edits a post that embeds the advanced_iframe shortcode with crafted attribute values containing JavaScript payloads or attribute-breaking characters. When the post is rendered on the front end or reviewed in preview, the payload runs in the visitor's browser. Successful exploitation can lead to cookie theft, forced administrative actions via cross-site request forgery, redirection to attacker-controlled infrastructure, or the insertion of persistent backdoors when an administrator triggers the payload.
No verified public proof-of-concept code is currently available. See the Wordfence Vulnerability Analysis and the WordPress Changeset 3279464 for technical details.
Detection Methods for CVE-2025-1437
Indicators of Compromise
- Posts or pages authored by contributor accounts containing [advanced_iframe] shortcodes with unusual attribute values, including angle brackets, quotes, or javascript: schemes.
- Unexpected <script> tags, event handlers such as onload= or onerror=, or external script references rendered inside iframe attributes.
- Outbound requests from visitor browsers to unfamiliar domains after loading pages that embed the plugin's shortcode.
Detection Strategies
- Audit the wp_posts table for entries containing the advanced_iframe shortcode and inspect attribute values for HTML metacharacters or scripting keywords.
- Review WordPress user role assignments and recent contributor activity, correlating post creation timestamps with content changes.
- Deploy a web application firewall rule that inspects shortcode attribute values in post_content for XSS payload patterns.
Monitoring Recommendations
- Monitor plugin version inventory across WordPress sites and flag any installation running Advanced iFrame at or below version 2025.2.
- Alert on new or modified posts submitted for review by contributor-level accounts that reference the vulnerable shortcode.
- Track browser-side Content Security Policy (CSP) violation reports to surface unauthorized inline script execution.
How to Mitigate CVE-2025-1437
Immediate Actions Required
- Upgrade the Advanced iFrame plugin to version 2025.3 or later on all WordPress sites.
- Review all existing posts and pages containing the advanced_iframe shortcode and remove or sanitize suspicious attribute values.
- Rotate credentials and invalidate active sessions for administrative users who may have viewed pages containing untrusted shortcodes.
Patch Information
The vendor introduced a partial fix in version 2024.5 and completed the remediation in version 2025.3. The corresponding code changes are documented in WordPress Changeset 3255604 and WordPress Changeset 3279464. Administrators should apply the update through the WordPress plugin manager or by deploying the patched release from the plugin repository.
Workarounds
- Restrict shortcode usage by removing the unfiltered_html capability from contributor and author roles and revoking access to the advanced_iframe shortcode where feasible.
- Require editorial review of all contributor submissions before publication, with explicit inspection of embedded shortcodes.
- Enforce a strict Content Security Policy that blocks inline scripts and restricts script sources to trusted origins.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
