CVE-2026-9831 | HackTesting

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.

Credits

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

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

References

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