CVE-2026-9831

MEDIUM

ExtremeCloud IQ Cross Tenant Data Exposure via Extreme Platform One Authentication Race Condition

Title source: cna

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.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory

https://community.extremenetworks.com/t5/security-advisories-formerly/sa-2026-048-extremecloud-iq-cross-tenant-data-exposure-via/ba-p/121851

Scores

CVSS v3 6.3

EPSS 0.0017

EPSS Percentile 6.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-362 CWE-488

Status published

Products (2)

Extreme Networks/Extreme Platform ONE < 25.10.0-104

Extreme Networks/Extreme Platform ONE 25.10.0-104

Published May 29, 2026

Tracked Since May 30, 2026