CVE-2026-9831 | THREATINT

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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.

PUBLISHED Reserved 2026-05-28 | Published 2026-05-29 | Updated 2026-05-29 | Assigner ExtremeNetworks

MEDIUM: 6.3CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Problem types

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

CWE-488 Exposure of data element to wrong session

Product status

Default status
unaffected

Any version before 25.10.0-104
affected

25.10.0-104 (custom)
unaffected

Credits

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

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

References

community.extremenetworks.com/…ta-exposure-via/ba-p/121851 vendor-advisory

cve.org (CVE-2026-9831)

nvd.nist.gov (CVE-2026-9831)

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