CVE-2016-10953 in Headway Theme
Summary
by MITRE
The Headway theme before 3.8.9 for WordPress has XSS via the license key field.
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Analysis
by VulDB Data Team • 12/19/2023
The vulnerability identified as CVE-2016-10953 affects the Headway WordPress theme version 3.8.8 and earlier, representing a cross-site scripting flaw that specifically targets the license key input field. This security weakness resides within the theme's administrative interface where users enter their license keys for activation purposes. The flaw allows malicious actors to inject arbitrary JavaScript code through the license key field, which then executes in the context of other users' browsers who view the affected administrative pages. Such vulnerabilities typically arise from insufficient input validation and output sanitization mechanisms that fail to properly escape or filter user-supplied data before rendering it within web pages.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious license key containing embedded script tags or other malicious code that gets processed and displayed within the theme's administrative dashboard. When administrators or other authenticated users navigate to pages displaying this information, their browsers execute the injected code, potentially leading to session hijacking, credential theft, or redirection to malicious sites. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting attacks where input data is not properly sanitized before being rendered in web pages. The attack vector leverages the trust relationship between the legitimate WordPress administrator and the vulnerable theme, making it particularly dangerous as it can bypass traditional security measures that rely on user authentication.
The operational impact of CVE-2016-10953 extends beyond simple data theft, as it can enable attackers to gain persistent access to WordPress administrative interfaces. Once compromised, attackers can modify theme settings, install malicious plugins, alter content, or even escalate privileges within the WordPress environment. The vulnerability affects not just individual installations but can potentially compromise entire WordPress networks if multiple sites use the same vulnerable theme version. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and control through web shells, as the XSS payload can establish persistent communication channels. Additionally, it supports credential access tactics through session hijacking and can facilitate privilege escalation by allowing attackers to modify theme configurations that may affect site security.
Organizations should immediately update to Headway theme version 3.8.9 or later to remediate this vulnerability, as no effective workarounds exist that maintain full functionality while addressing the XSS flaw. Security administrators should conduct comprehensive vulnerability assessments to identify any other potentially vulnerable themes or plugins within their WordPress installations. The remediation process must include thorough testing of updated themes to ensure compatibility with existing site configurations. Additionally, implementing proper input validation and output encoding practices should be enforced across all WordPress themes and plugins, particularly in administrative interfaces where user input is processed. Regular security audits and vulnerability scanning should be maintained to detect similar issues in custom-developed WordPress components, as this vulnerability demonstrates the critical importance of sanitizing all user inputs in web applications. Organizations should also consider implementing web application firewalls and content security policies to provide additional defense-in-depth measures against similar cross-site scripting vulnerabilities.