CVE-2026-24776 is an authorization bypass vulnerability classified under CWE-639 (Authorization Bypass Through User-Controlled Key) affecting OpenProject, an open-source web-based project management tool. The flaw exists in the drag-and-drop handler responsible for moving agenda items between meeting sections. Specifically, prior to version 17.0.2, the software failed to verify that the target meeting section belonged to the same meeting or was the backlog in recurring meetings. This improper validation allowed an authenticated attacker with permission to move agenda items to relocate them into different meetings arbitrarily. While the attacker does not gain access to the content of other meetings or escalate privileges, they can insert misleading or irrelevant agenda items, potentially causing confusion and disrupting meeting workflows. The vulnerability requires the attacker to be authenticated (PR:L) but does not require user interaction beyond that. The attack vector is network-based (AV:N), and the complexity is low (AC:L). The CVSS v3.1 base score is 4.3, indicating medium severity, with impact limited to integrity (I:L) and no impact on confidentiality or availability. No known exploits are currently in the wild. The issue was resolved in OpenProject version 17.0.2 by adding proper validation checks to ensure agenda items can only be moved within the same meeting or to the backlog as appropriate.

For European organizations using OpenProject, this vulnerability can lead to operational disruptions by allowing unauthorized modification of meeting agendas. While it does not expose sensitive data or allow privilege escalation, the ability to insert arbitrary agenda items into unrelated meetings can cause confusion, miscommunication, and potential delays in decision-making processes. This is particularly impactful for organizations relying heavily on OpenProject for coordinating complex projects and meetings, such as government agencies, large enterprises, and collaborative research institutions. The integrity of meeting content is compromised, which could indirectly affect project outcomes or compliance with internal governance. Since exploitation requires authentication, insider threats or compromised user accounts pose the greatest risk. The vulnerability does not affect system availability or confidentiality directly but undermines trust in meeting management workflows.

European organizations should promptly upgrade OpenProject installations to version 17.0.2 or later, where the vulnerability is fixed. Until patching is possible, administrators should restrict drag-and-drop permissions for agenda items to trusted users only and monitor meeting agenda changes for unusual activity. Implementing strict access controls and auditing user actions related to meeting management can help detect and prevent exploitation. Additionally, organizations should enforce strong authentication mechanisms and monitor for compromised accounts to reduce the risk of insider exploitation. Training users to recognize and report suspicious agenda modifications can further mitigate operational impact. Regularly reviewing OpenProject release notes and security advisories will ensure timely awareness of similar vulnerabilities.