CVE-2026-69115 OpenIMSDK CVE debrief

Who should care

Defenders responsible for OpenIM Server deployments should assess exposure and prioritize remediation. This vulnerability could allow attackers to gather sensitive information about user accounts and groups, potentially leading to further exploitation.

Why it matters

CVE-2026-69115 is a missing authorization vulnerability in OpenIM Server v3.8.3 that allows authenticated users to access admin-only API endpoints for user and group enumeration. Defenders should prioritize verifying and remediating this vulnerability, especially in systems where user account and group enumeration could lead to further exploitation. The impact of this vulnerability is significant as it could allow attackers to gather sensitive information about user accounts and groups, potentially leading to targeted attacks or lateral movement within the system. Remediation involves verifying the version of OpenIM Server, restricting access to admin-only management API endpoints, implementing proper authorization checks for API endpoints, and monitoring for suspicious activity related to user account and group enumeration.

• User account and group enumeration could lead to targeted attacks
• Exposure of sensitive information about user accounts and groups
• Potential for lateral movement within the system
• Verification of proper authorization checks for API endpoints

Technical summary

The OpenIM Server v3.8.3 contains a missing authorization vulnerability. This allows any authenticated user to access admin-only management API endpoints by submitting POST requests with a regular user bearer token to /user/get_users, /user/get_all_users_uid, and /group/get_groups. The absent authverify.CheckAdmin() call in the GetPaginationUsers, GetAllUserID, and GetGroups handlers enables attackers to enumerate all platform user accounts, including userIDs, nicknames, and manager level flags, as well as all groups, including private groups the user has never joined, exposing group names, owner IDs, and member counts.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability, especially in systems where user account and group enumeration could lead to further exploitation.

Recommended defensive actions

• Verify the version of OpenIM Server and check if it's vulnerable
• Restrict access to admin-only management API endpoints
• Implement proper authorization checks for API endpoints
• Monitor for suspicious activity related to user account and group enumeration
• Perform an inventory of assets using OpenIM Server
• Review logs for potential exploitation attempts
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide details on the missing authorization vulnerability in OpenIM Server v3.8.3. The vulnerability allows authenticated users to access admin-only API endpoints for user and group enumeration.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.