The vulnerability identified as CVE-2026-24668 affects the Open eClass platform, a widely used course management system, formerly known as GUnet eClass. Prior to version 4.2, the platform contained an improper access control weakness (CWE-284) that allowed authenticated students to add content to existing course units. Normally, only users with elevated privileges such as instructors or administrators should be able to modify course content. This flaw arises from insufficient enforcement of role-based permissions, enabling lower-privileged users to perform unauthorized actions. The vulnerability is remotely exploitable over the network (AV:N), requires low attack complexity (AC:L), and only needs privileges of an authenticated user (PR:L) without additional user interaction (UI:N). The impact is limited to integrity (I:H) with no confidentiality (C:N) or availability (A:N) loss. The vulnerability was publicly disclosed and assigned a CVSS v3.1 base score of 6.5, categorized as medium severity. Although no known exploits have been reported in the wild, the risk remains significant for institutions running vulnerable versions. The issue was addressed in Open eClass version 4.2, which enforces proper access controls to restrict content modification to authorized roles only.

For European organizations, particularly educational institutions using Open eClass, this vulnerability threatens the integrity of course content. Unauthorized content additions by students could lead to misinformation, academic dishonesty, or disruption of learning materials. While confidentiality and availability are not directly impacted, the trustworthiness of the educational platform is undermined. This could affect student assessments, accreditation processes, and institutional reputation. The risk is higher in countries where Open eClass has significant adoption, such as Greece, where the platform originated and is widely used. Additionally, universities and colleges with remote learning components may face increased exposure due to network accessibility. Although no active exploitation is reported, the vulnerability could be leveraged in targeted attacks to manipulate academic records or spread malicious content within courses.

The primary mitigation is to upgrade all Open eClass installations to version 4.2 or later, where the access control issue has been fixed. Organizations should conduct an immediate inventory of their Open eClass versions and prioritize patching vulnerable instances. In addition to patching, administrators should audit course content for unauthorized additions or modifications, especially those made by student accounts. Implementing enhanced monitoring and alerting on content changes can help detect suspicious activity early. Reviewing and tightening role-based access controls and permissions within the platform can reduce the risk of privilege escalation. For institutions unable to upgrade immediately, temporary measures include restricting student permissions, disabling content addition features for students, or isolating vulnerable systems from external networks. User education on security best practices and awareness of potential misuse is also recommended.