StackStorm st2 up to 3.9.0 NoOp RBAC backend actionexecutions.py User privileges management

Summaryinfo

A vulnerability classified as critical was found in StackStorm st2 up to 3.9.0. Impacted is the function assert_user_is_admin_if_user_query_param_is_provided of the file st2api/st2api/controllers/v1/actionexecutions.py of the component NoOp RBAC backend. Such manipulation of the argument User leads to privileges management. This vulnerability is listed as CVE-2026-85513. The attack may be performed from remote. In addition, an exploit is available. Prior advisory CVE-2022-44009 was reported as a follow-up on the same sink, but this issue is distinct: it needs no Jinja RBAC und affects default install with RBAC disabled. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability was found in StackStorm st2 up to 3.9.0 and classified as critical. Affected by this issue is the function assert_user_is_admin_if_user_query_param_is_provided of the file st2api/st2api/controllers/v1/actionexecutions.py of the component NoOp RBAC backend. The manipulation of the argument user 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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-85513. The exploitation is known to be easy. The attack may be launched remotely. Technical details as well as a public exploit are known. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The exploit is available at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet. Prior advisory CVE-2022-44009 was reported as a follow-up on the same sink, but this issue is distinct: it needs no Jinja RBAC und affects default install with RBAC disabled.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• StackStorm

Name

• st2

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9.0

Website

• Product: https://github.com/StackStorm/st2/

CPE 2.3info

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Submitinfo

Accepted

• Submit #894916: StackStorm st2 3.9.0 Improper Privilege Management (by geochen)

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