Vulnerability · Published May 29, 2026 · Assigned by ExtremeNetworks
CVE-2026-9831ExtremeCloud IQ Cross Tenant Data Exposure via Extreme Platform One Authentication Race Condition
Medium 6.3
In plain English
A medium-severity race condition in Extreme Platform ONE from Extreme Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Official description
A race condition in the shared Extreme Platform ONE IAM Gateway API-key authentication path could, under specific high-concurrency traffic conditions, intermittently allow requests authenticated with an Extreme Platform ONE /IAM-issued API key to receive response data for another tenant. The issue was observed through ExtremeCloud IQ/XIQ API endpoints and validated against both XIQ/XAPI and Extreme Platform ONE /Common Services API paths. XIQ-native tokens and standard OAuth/Bearer JWT authentication were not affected.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Extreme Networks | Extreme Platform ONE | 0 – before 25.10.0-104 |
Weakness: CWE-362, CWE-488 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N