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CVE Vulnerability Details :
CVE-2026-9831
PUBLISHED
More InfoOfficial Page
Assigner-ExtremeNetworks
Assigner Org ID-1c053176-eef3-4d6a-ae0b-24728c86587b
View Known Exploited Vulnerability (KEV) details
Published At-29 May, 2026 | 21:19
Updated At-29 May, 2026 | 21:19
Rejected At-
▼CVE Numbering Authority (CNA)
ExtremeCloud IQ Cross Tenant Data Exposure via Extreme Platform One Authentication Race Condition

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
Vendor
Extreme Networks
Product
Extreme Platform ONE
Platforms
  • SaaS (Cloud Hosted)
Default Status
unaffected
Versions
Affected
  • From 0 before 25.10.0-104 (custom)
Unaffected
  • 25.10.0-104 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-362CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)
CWECWE-488CWE-488 Exposure of data element to wrong session
Type: CWE
CWE ID: CWE-362
Description: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)
Type: CWE
CWE ID: CWE-488
Description: CWE-488 Exposure of data element to wrong session
Metrics
VersionBase scoreBase severityVector
3.16.3MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Version: 3.1
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-74CAPEC-74: Manipulating State
CAPEC ID: CAPEC-74
Description: CAPEC-74: Manipulating State
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Sebastian Koller of Iteas IT Services GmbH (Austria) for responsible discovery and disclosure of this vulnerability.
reporter
Sebastian Koller of Iteas IT Services GmbH (Austria) for responsible coordination and providing detailed evidence supporting root cause identification.
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://community.extremenetworks.com/t5/security-advisories-formerly/sa-2026-048-extremecloud-iq-cross-tenant-data-exposure-via/ba-p/121851
vendor-advisory
Hyperlink: https://community.extremenetworks.com/t5/security-advisories-formerly/sa-2026-048-extremecloud-iq-cross-tenant-data-exposure-via/ba-p/121851
Resource:
vendor-advisory
Details not found