Improper Privilege Management in StackStorm st2 by OpenStack
CVE-2026-85513

5.3MEDIUM

Key Information:

Vendor

Stackstorm

Status
St2
Vendor
CVE Published:
4 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-85513?

A vulnerability has been identified in StackStorm st2 versions up to 3.9.0, specifically in the NoOp RBAC backend. The flaw lies within the function handling user privileges, which can be exploited remotely due to improper management of user authorization. Attackers can manipulate user query parameters to escalate privileges, potentially leading to unauthorized access to sensitive functionalities. This issue is distinct from previous advisories, such as CVE-2022-44009, as it can be exploited on default installations with RBAC disabled. Despite an early report to the project maintainers, no corrective action has been communicated.

Affected Version(s)

st2 3.0

st2 3.1

st2 3.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-85513 - Proof of Concept

References

https://vuldb.com/vuln/398678
vdb-entrytechnical-description
https://vuldb.com/vuln/398678/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-85513
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

geochen (VulDB User)
VulDB CNA Team
.