CVE-2026-24134 identifies a Broken Object Level Authorization (BOLA) vulnerability in StudioCMS, a server-side-rendered, Astro native, headless content management system. The flaw exists in versions prior to 0.2.0 within the Content Management feature, where authorization checks fail to properly restrict access to draft content. Specifically, users assigned the 'Visitor' role, which is intended to have minimal access, can exploit this vulnerability by manipulating user-controlled keys to retrieve draft content created by users with elevated roles such as Editor, Admin, or Owner. This bypass occurs because the system does not adequately verify that the requesting user is authorized to access the requested content object, violating the principle of least privilege. The vulnerability is classified under CWE-639 (Authorization Bypass Through User-Controlled Key) and CWE-862 (Missing Authorization). The CVSS v3.1 base score is 6.5 (medium severity), reflecting the network attack vector, low attack complexity, requirement for privileges (Visitor role), no user interaction, unchanged scope, and high impact on confidentiality. The vulnerability does not affect integrity or availability. The flaw is remediated in StudioCMS version 0.2.0 by implementing proper authorization checks to ensure that only users with appropriate roles can access draft content. No known exploits have been reported in the wild as of the publication date. Organizations using StudioCMS should assess their version and upgrade accordingly to prevent unauthorized disclosure of sensitive unpublished content.

For European organizations, the primary impact of CVE-2026-24134 is the unauthorized disclosure of sensitive draft content within StudioCMS. This can lead to premature exposure of confidential information, intellectual property, or strategic communications before official release, potentially damaging reputation and competitive advantage. Media companies, marketing agencies, and enterprises relying on StudioCMS for content management are particularly at risk. Although the vulnerability does not compromise data integrity or system availability, the breach of confidentiality can violate data protection regulations such as GDPR if personal or sensitive data is exposed. Additionally, unauthorized access to draft content may facilitate further social engineering or targeted attacks. The requirement of a 'Visitor' role for exploitation limits the attack surface to authenticated users with minimal privileges, but insider threats or compromised low-privilege accounts could leverage this vulnerability. The absence of known exploits reduces immediate risk but does not eliminate the potential for future attacks. Organizations should prioritize patching and review access controls to mitigate exposure.

To effectively mitigate CVE-2026-24134, European organizations should: 1) Immediately upgrade StudioCMS to version 0.2.0 or later, where the vulnerability is patched. 2) Conduct an audit of user roles and permissions within StudioCMS to ensure the 'Visitor' role is assigned only to trusted users and that no unnecessary privileges are granted. 3) Implement strict access control policies and monitor access logs for unusual activity involving draft content retrieval. 4) Employ network segmentation and zero-trust principles to limit access to the CMS backend, reducing the risk from compromised low-privilege accounts. 5) Where possible, enable multi-factor authentication (MFA) for all CMS users to reduce the risk of account compromise. 6) Review and sanitize draft content to minimize sensitive information exposure in case of unauthorized access. 7) Establish an incident response plan specific to CMS content breaches to quickly address any unauthorized disclosures. 8) Stay informed on updates from the vendor and security advisories related to StudioCMS.