CVE-2026-66599
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
Unauthenticated Cross Site Scripting (XSS) in WPComplete versions up to 2.9.5.6. Allows injecting malicious script into the page.
Risk Assessment
Risk of session theft or unauthorized actions on behalf of users.
Recommendation
Update WPComplete to the latest version that includes the fix.
Other vulnerabilities in WPComplete
See all- CVE-2026-66479High
A Cross-Site Request Forgery (CSRF) vulnerability in WPComplete from Liquid Web / StellarWP allows Stored XSS. This issue affects WPComplete from n/a through 2.9.5.6.
- CVE-2026-77820Medium
The WPComplete plugin for WordPress (versions up to and including 2.9.9.0) is vulnerable to Stored Cross-Site Scripting via the 'empty' Shortcode Attribute due to insufficient input sanitization and output escaping. This allows authenticated attackers with contributor-level access and above to inject arbitrary web scripts into pages that execute whenever a user accesses an injected page. This requires the premium version of the software. Please note this only affects the pro version.
- CVE-2025-49906Medium
The WPComplete plugin has a missing authorization vulnerability, allowing access to functionality not properly constrained by ACLs. Affects versions up to and including 2.9.5.3.
- CVE-2025-58974Medium
The WPComplete WordPress plugin contains a Stored Cross-site Scripting (XSS) vulnerability caused by improper neutralization of input during web page generation. The issue affects versions up to and including 2.9.5.2.
Original NVD description (English source)
Unauthenticated Cross Site Scripting (XSS) in WPComplete <= 2.9.5.6 versions.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS