Critical Ghost CMS Vulnerability Exploited to Hijack Over 700 Websites
A critical security flaw in Ghost CMS, identified as CVE-2026-26980, has been actively exploited by threat actors to compromise more than 700 websites across various sectors. This vulnerability, present in Ghost versions 3.24.0 through 6.19.0, allows unauthenticated attackers to perform arbitrary reads from the database, leading to significant security breaches.
Understanding CVE-2026-26980
Ghost CMS, a popular Node.js-based content management system, was found to have a severe SQL injection vulnerability within its Content API. This flaw enables attackers to read arbitrary data from the database without authentication, posing a high risk to data confidentiality and integrity. The vulnerability was addressed in version 6.19.1, released in February 2026.
Exploitation and Impact
In May 2026, security researchers from QiAnXin XLab reported that attackers were exploiting CVE-2026-26980 to inject malicious JavaScript code into compromised websites. By obtaining the Admin API Key without authorization, attackers could modify articles en masse, embedding harmful scripts that facilitated fake CAPTCHA attacks. This large-scale campaign affected over 700 websites, including those in academia, blockchain, artificial intelligence, SaaS, security research, media, and financial technology sectors.
Technical Details
The root cause of CVE-2026-26980 lies in improper input validation within Ghost’s Content API, specifically in the slug filter ordering mechanism. User-supplied slug values were directly concatenated into SQL CASE statements without proper sanitization, allowing attackers to inject arbitrary SQL syntax. This vulnerability is particularly dangerous because it requires no authentication, enabling any external attacker with network access to exploit it and extract sensitive information from the database.
Mitigation Measures
To protect against this vulnerability, administrators are urged to upgrade Ghost CMS to version 6.19.1 or later immediately. Additionally, implementing proactive monitoring of database access logs for unusual query patterns and deploying Web Application Firewalls (WAFs) can help detect and prevent exploitation attempts.
Conclusion
The exploitation of CVE-2026-26980 underscores the critical importance of timely software updates and robust security practices. Organizations using Ghost CMS should prioritize patching this vulnerability to safeguard their websites and sensitive data from unauthorized access and manipulation.
