CVE-2017-6818 in WordPress
Summary
by MITRE
In WordPress before 4.7.3 (wp-admin/js/tags-box.js), there is cross-site scripting (XSS) via taxonomy term names.
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Analysis
by VulDB Data Team • 12/25/2024
The vulnerability identified as CVE-2017-6818 represents a critical cross-site scripting flaw discovered in WordPress versions prior to 4.7.3, specifically within the wp-admin/js/tags-box.js JavaScript file. This vulnerability affects the handling of taxonomy term names in the WordPress administrative interface, creating a potential vector for malicious actors to inject harmful scripts into the system. The flaw exists in the client-side JavaScript code responsible for managing tag and taxonomy terms within the WordPress dashboard, making it particularly dangerous as it operates in the context of authenticated administrative sessions.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization of taxonomy term names within the tags-box.js file. When administrators or users with appropriate privileges create or edit taxonomy terms, the system fails to properly escape or sanitize special characters that could be interpreted as HTML or JavaScript code. This inadequate sanitization allows attackers to inject malicious scripts that execute in the context of other users' browsers when they view affected pages. The vulnerability specifically impacts the WordPress administrative interface where taxonomy terms are managed, particularly affecting the tag management functionality that relies on the problematic JavaScript file.
The operational impact of CVE-2017-6818 extends beyond simple script injection as it can be exploited to perform various malicious activities within the WordPress environment. Attackers could leverage this vulnerability to steal administrative credentials, manipulate content, or redirect users to malicious websites. The vulnerability is particularly concerning because it operates within the WordPress admin interface where users have elevated privileges, potentially allowing for complete system compromise. Given that WordPress powers a significant portion of websites globally, this vulnerability could affect numerous administrative users and their sessions, making it a prime target for exploitation.
Security professionals should note that this vulnerability aligns with CWE-79, which defines Cross-Site Scripting as a common weakness in web applications where untrusted data is improperly handled and executed in web browsers. The vulnerability also maps to ATT&CK technique T1059.007, which covers JavaScript and VBScript execution, demonstrating how this flaw could be exploited as part of broader attack chains. Organizations should implement immediate mitigations including updating to WordPress version 4.7.3 or later, which contains the necessary patches for this vulnerability. Additionally, implementing Content Security Policy headers and regular security auditing of JavaScript files can provide additional defense layers against similar vulnerabilities in the future.