CVE-2026-86416 in ILIAS
Summary
by MITRE • 09/07/2026
ILIAS versions before 9.23, 10.11, and 11.4 contain an authorization bypass vulnerability in ilObjGroupGUI where saveMapSettingsObject() and updateGroupTypeObject() perform state-changing operations without write permission checks. Authenticated users with only read access to a group can craft POST requests to modify group map settings and didactic template assignments, changing group modes and permissions for all members.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 09/07/2026
The vulnerability identified in ILIAS versions prior to 9.23, 10.11, and 11.4 represents a critical authorization bypass within the ilObjGroupGUI component of the learning management system. This flaw specifically affects two methods: saveMapSettingsObject() and updateGroupTypeObject(). These functions are designed to handle state-changing operations related to group configuration, such as modifying map settings and assigning didactic templates. However, they fail to enforce proper access control checks before executing these modifications. The core technical deficiency lies in the absence of write permission validation for authenticated users who possess only read-level access to a specific group object. In a properly secured system, any operation that alters the state or configuration of an entity must verify that the requesting user has explicit write privileges for that entity. ILIAS fails this fundamental security principle by allowing these critical updates to proceed based solely on the presence of authentication and basic read access, rather than requiring elevated permissions appropriate for administrative changes.
From a technical perspective, this vulnerability enables authenticated attackers with limited group membership rights to manipulate internal system configurations through crafted HTTP POST requests. By targeting the endpoints associated with saveMapSettingsObject() or updateGroupTypeObject(), an attacker can inject malicious payloads that alter how groups are displayed and structured within the platform. This includes changing group modes, which may affect visibility and interaction rules for all members, as well as modifying didactic template assignments that dictate the pedagogical structure of the course content. Because these operations do not validate whether the user has administrative or editor rights to the group, a standard participant can effectively assume the role of an administrator regarding configuration changes. This bypasses the intended security model where only designated instructors or administrators should have the authority to restructure group properties.
The operational impact of this vulnerability is significant and extends beyond simple data modification. By altering group map settings and didactic templates, attackers can disrupt the learning environment for other users. For instance, changing the group mode might restrict access to course materials for legitimate students or expose sensitive administrative features to unauthorized participants. Furthermore, modifying template assignments could lead to inconsistent presentation of content, potentially confusing learners or breaking integrated third-party tools that rely on specific structural configurations. In a broader security context, this flaw undermines the integrity and availability aspects of the CIA triad. It allows low-privileged users to escalate their effective privileges within the application logic without needing higher-level system credentials, creating an avenue for persistent disruption and potential further exploitation if these configuration changes expose other downstream vulnerabilities in dependent modules.
This vulnerability aligns with CWE-269, which describes Improper Privilege Assignment, as well as CWE-862, Missing Authorization, because the application fails to enforce required access controls on a protected resource or action. In terms of offensive security frameworks such as MITRE ATT&CK, this behavior is consistent with techniques found under Tactic TA0004 (Privilege Escalation) and specifically relates to methods where attackers exploit misconfigured permissions to gain unauthorized control over system components. The ability to modify group settings via POST requests also touches upon aspects of input validation failures often associated with Cross-Site Request Forgery patterns, although the primary issue here is the lack of server-side authorization checks rather than client-side token verification alone.
To mitigate this vulnerability, administrators must upgrade ILIAS to version 9.23 or later for legacy systems, or versions 10.11 and 11.4 or newer for current release tracks. These updates include patches that enforce strict write permission checks within the ilObjGroupGUI methods before allowing any state-changing operations. Until an upgrade is performed, organizations should implement compensating controls such as web application firewall rules to block suspicious POST requests targeting these specific endpoints if they originate from users with read-only roles. Additionally, reviewing and tightening role-based access control policies can help limit exposure by ensuring that fewer accounts hold even basic group membership rights unless absolutely necessary for their educational function. Regular security audits focusing on authorization logic in custom modules or plugins are also recommended to prevent similar bypasses in other parts of the application ecosystem.