CVE-2026-85513 Details
Description
A weakness has been identified in StackStorm st2 up to 3.9.0. This issue affects 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. This manipulation of the argument User causes improper privilege management. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. 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.
A vulnerability has been identified in StackStorm st2 versions through 3.9.0, within the NoOp RBAC backend. The issue arises in the 'assert_user_is_admin_if_user_query_param_is_provided' function, located in 'st2api/controllers/v1/actionexecutions.py'. This vulnerability allows authenticated users to impersonate other users by manipulating the 'user' parameter in action execution requests. As a result, an attacker can bypass privilege checks, access user-specific secrets, and execute actions under the guise of the impersonated user.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 4, 2026CISA-ADP
Assessed Sep 8, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/StackStorm/st2/ | [email protected] | Source CodeVendor |
| https://github.com/StackStorm/st2/issues/6379 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://vuldb.com/cve/CVE-2026-85513 | [email protected] | Partial Content |
| https://vuldb.com/submit/894916 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/398678 | [email protected] | Partial Content |
| https://vuldb.com/vuln/398678/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-266 | Incorrect Privilege Assignment | [email protected] |
| CWE-269 | Improper Privilege Management | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| StackStorm | <= 3.9.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 8, 2026 | CVE Modified | CISA-ADP |
| Sep 4, 2026 | New CVE Received | [email protected] |