CVE-2025-6987 in Advanced iFrame Plugin
Summary
by MITRE • 07/26/2025
The Advanced iFrame plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'advanced_iframe' shortcode in all versions up to, and including, 2025.5 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 • 07/26/2025
The Advanced iFrame plugin for WordPress presents a critical stored cross-site scripting vulnerability identified as CVE-2025-6987, affecting all versions up to and including 2025.5. This vulnerability resides within the plugin's 'advanced_iframe' shortcode implementation where insufficient input sanitization and output escaping mechanisms fail to properly validate user-supplied attributes. The flaw specifically impacts the plugin's handling of shortcode parameters, creating a persistent XSS vector that can be exploited by authenticated attackers possessing contributor-level privileges or higher.
The technical exploitation of this vulnerability occurs through the manipulation of shortcode attributes that are processed without adequate sanitization measures. When an authenticated attacker with contributor access or above injects malicious script code into the plugin's shortcode parameters, the malicious payload becomes permanently stored within the WordPress database. This stored script executes every time any user accesses a page containing the compromised shortcode, making the vulnerability particularly dangerous as it can affect multiple users without requiring additional interaction from the target. The vulnerability maps directly to CWE-79: Improper Neutralization of Input During Web Page Generation, which classifies improper input sanitization as a fundamental weakness in web application security.
The operational impact of CVE-2025-6987 extends beyond simple script execution, as it provides attackers with the ability to perform session hijacking, credential theft, and data exfiltration from authenticated users. The vulnerability affects any WordPress installation using the Advanced iFrame plugin, with the attack surface expanding to include all pages that utilize the compromised shortcode functionality. Given that contributor-level access is sufficient for exploitation, this vulnerability represents a significant risk to WordPress sites where multiple users have varying permission levels, as it can be leveraged to escalate privileges or compromise user sessions. The stored nature of the vulnerability means that once exploited, the malicious payload remains persistent until manually removed from the database.
Mitigation strategies for CVE-2025-6987 should prioritize immediate plugin updates to versions that address the input sanitization and output escaping deficiencies. Organizations should implement comprehensive input validation on all user-supplied data, particularly for shortcode parameters and other dynamic content generation points. The principle of least privilege should be enforced by restricting contributor-level access to plugin configuration options where possible, and implementing additional security measures such as Content Security Policy headers to limit script execution. Regular security audits of WordPress plugins should include verification of input sanitization practices and output escaping mechanisms, with particular attention to the ATT&CK technique T1059.001 for Command and Scripting Interpreter and T1566.001 for Phishing to prevent exploitation through malicious script injection vectors. Additionally, implementing web application firewalls and monitoring for unusual shortcode parameter usage patterns can provide early detection of potential exploitation attempts.