CVE-2026-29784 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the Ghost content management system, a popular Node.js-based platform used for publishing and blogging. The vulnerability exists in versions from 5.101.6 up to 6.19.2 due to incomplete CSRF protections around the /session/verify endpoint. Specifically, the system allowed one-time tokens (OTCs) to be used in login sessions that differed from the requesting session, breaking the intended session binding and enabling attackers to perform unauthorized actions on behalf of authenticated users. This flaw could be exploited by attackers through phishing techniques, tricking users into submitting malicious requests that could hijack their authenticated sessions or perform unauthorized administrative actions. The vulnerability has a CVSS 3.1 base score of 7.5, reflecting high severity due to its network attack vector, requirement for user interaction, and potential to compromise confidentiality, integrity, and availability of the affected Ghost sites. The issue was addressed and patched in Ghost version 6.19.3, closing the CSRF protection gap. No public exploits have been reported to date, but the risk remains significant for unpatched systems.

The impact of CVE-2026-29784 on organizations worldwide can be substantial, particularly for those relying on Ghost CMS for content publishing and site management. Successful exploitation could lead to unauthorized account takeover, allowing attackers to manipulate site content, steal sensitive data, or disrupt service availability. This compromises the confidentiality, integrity, and availability of the affected systems. Phishing campaigns leveraging this vulnerability could escalate attacks by tricking legitimate users into executing malicious requests. Organizations hosting multiple Ghost sites or those with high-traffic platforms are at increased risk of reputational damage and operational disruption. Additionally, compromised sites could be used as vectors for further attacks or malware distribution, amplifying the threat landscape.

To mitigate CVE-2026-29784, organizations should immediately upgrade all affected Ghost CMS instances to version 6.19.3 or later, where the vulnerability has been patched. Beyond patching, administrators should enforce strict Content Security Policies (CSP) to limit the execution of unauthorized scripts and reduce the risk of CSRF exploitation. Implementing multi-factor authentication (MFA) can add an additional layer of defense against session hijacking. Regularly auditing and monitoring user sessions and login activities can help detect anomalous behavior indicative of exploitation attempts. Web Application Firewalls (WAFs) configured to detect and block CSRF attack patterns can provide additional protection. Educating users about phishing risks and encouraging cautious interaction with unsolicited links or requests is also critical. Finally, developers should review and strengthen CSRF protections in custom integrations or plugins related to Ghost CMS.