deepstreamIO Deepstream up to 10.1.0 Permission Valve rules-map.ts ConfigPermission.canPerformAction permission.type privileges management

Summaryinfo

A vulnerability described as critical has been identified in deepstreamIO Deepstream up to 10.1.0. Impacted is the function ConfigPermission.canPerformAction of the file src/services/permission/valve/rules-map.ts of the component Permission Valve. Such manipulation of the argument permission.type leads to privileges management. This vulnerability is uniquely identified as CVE-2026-63116. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in deepstreamIO Deepstream up to 10.1.0 and classified as critical. Affected by this issue is the function ConfigPermission.canPerformAction of the file src/services/permission/valve/rules-map.ts of the component Permission Valve. The manipulation of the argument permission.type with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

deepstream is a server that allows clients and backend services to sync data, send messages and make rpcs at scale. From 10.1.0 until 10.1.1, src/services/permission/valve/rules-map.ts omits RECORD_ACTION.PATCH_MULTI from RULES_MAP. When an authenticated user sends a PATCH_MULTI record operation while permission.type is config, getRulesForMessage returns a null rule specification and ConfigPermission.canPerformAction treats the missing specification as an unconditional allow instead of applying RULE_TYPES.WRITE. Any authenticated user can therefore modify arbitrary protected records, corrupt application state, or cause service disruption; deployments using the default permission type none already allow all operations and are not additionally affected. This issue is fixed in version 10.1.1.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-63116 since 07/15/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 10.1.1 eliminates this vulnerability.

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Productinfo

Vendor

• deepstreamIO

Name

• Deepstream

Version

• 10.0
• 10.1.0

CPE 2.3info

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