A critical authorization bypass vulnerability in deepstream.io permits authenticated users to modify protected records, potentially leading to full data corruption or service disruption.

The vulnerability exists due to an omitted mapping in the permission service, which causes the application to default to an unconditional allow when processing PATCH_MULTI operations from any authenticated user. This flaw effectively bypasses intended write restrictions for configured permissions.

The ability for any authenticated user to modify arbitrary protected records poses a significant risk to data integrity and system availability. Given the CVSS score of 8.8, this vulnerability is classified as High, as it allows attackers to corrupt application state and disrupt critical backend services without requiring administrative privileges.

Immediate Action: Upgrade deepstream.io to version 10.1.1 or later to implement the necessary rule mapping and restore proper authorization checks.

Proactive Monitoring: Review application access logs for unusual PATCH_MULTI operation patterns or unauthorized attempts to modify protected records.

Compensating Controls: If immediate patching is not feasible, restrict network access to the deepstream server to known and trusted internal clients only to limit the exposure of the authenticated interface.

Public Exploit Available: Unknown

Organizations utilizing deepstream.io versions 10.1.0 must prioritize the transition to version 10.1.1 immediately. The ease of exploitation for authenticated users makes this a high priority task to prevent potential data corruption and unauthorized state changes within the environment.