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Medium severity · published May 29, 2026
CVE-2026-9831
ExtremeCloud IQ Cross Tenant Data Exposure via Extreme Platform One Authentication Race Condition
6.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EP
Extreme Platform ONE · Extreme Networks
before 25.10.0-104 · source: vendor
Affected product
EP
Extreme Platform ONE
Extreme Networks
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9831
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9831
community.extremenetworks.com
https://community.extremenetworks.com/t5/security-advisories-formerly/sa-2026-048-extremecloud-iq-cross-tenant-data-exposure-via/ba-p/121851