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

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Summary

CVECVE-2026-9831
StatePUBLISHED
AssignerExtremeNetworks
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-29 22:16:23 UTC
Updated2026-06-01 18:02:29 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 6.3 MEDIUM from 1c053176-eef3-4d6a-ae0b-24728c86587b

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

EPSS: 0.000500000 probability, percentile 0.158450000 (date 2026-06-01)

Problem Types: CWE-362 | CWE-488 | CWE-362 CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition) | CWE-488 CWE-488 Exposure of data element to wrong session

VersionSourceTypeScoreSeverityVector
3.11c053176-eef3-4d6a-ae0b-24728c86587bSecondary6.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNACVSS6.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Extreme Networks Extreme Platform ONE affected 25.10.0-104 custom SaaS (Cloud Hosted)
CNA Extreme Networks Extreme Platform ONE unaffected 25.10.0-104 custom SaaS (Cloud Hosted)

References

ReferenceSourceLinkTags
community.extremenetworks.com/t5/security-advisories-formerly/sa-2026-048-extremecloud-iq-c... 1c053176-eef3-4d6a-ae0b-24728c86587b community.extremenetworks.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Sebastian Koller of Iteas IT Services GmbH (Austria) for responsible discovery and disclosure of this vulnerability. (en)

CNA: Sebastian Koller of Iteas IT Services GmbH (Austria) for responsible coordination and providing detailed evidence supporting root cause identification. (en)

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