node-opcua up to 2.179.x SessionContext.getApplicableRolePermissions access control

Summaryinfo

A vulnerability was found in node-opcua up to 2.179.x and classified as critical. Affected is the function SessionContext.getApplicableRolePermissions. Such manipulation leads to access control. This vulnerability is documented as CVE-2026-95860. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in node-opcua up to 2.179.x. Affected by this issue is the function SessionContext.getApplicableRolePermissions. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

node-opcua is an OPC UA implementation for TypeScript and Node.js. From 2.42.0 until 2.180.0, namespace-level access control configured through setDefaultRolePermissions is not honored by the runtime enforcement path for nodes without explicit per-node RolePermissions. SessionContext.getApplicableRolePermissions reads a missing or null DefaultRolePermissions metadata value instead of the configured namespace field, and the null result is treated permissively. An anonymous network client can consequently write variables with CurrentWrite access or call bound methods when an operator configured a restrictive namespace default and relied on inheritance. Servers with no declared policy, nodes with explicit per-node permissions, and correctly bound programmatic namespace metadata are outside the authorization-bypass case. This issue is fixed in version 2.180.0.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-95860 since 09/22/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 2.180.0 eliminates this vulnerability.

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Productinfo

Name

• node-opcua

Version

• 2.179

Website

• Product: https://github.com/node-opcua/node-opcua/

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