CVE-2026-9831Network attack vector

Cross-tenant data disclosure via IAM Gateway race

Published May 29, 2026 · Updated May 29, 2026

Race condition in Extreme Platform ONE before 25.10.0-104 allows remote authenticated users to read another tenant's API data. The shared IAM Gateway API-key authentication path mishandles tenant association among concurrent requests, returning response data from a different tenant. Exploitation requires a valid Platform ONE IAM-issued API key and specific high-concurrency traffic; XIQ-native tokens and OAuth/Bearer JWTs are unaffected.

CVSS severity6.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Extreme Platform ONE before 25.10.0-104 allows remote authenticated users to read another tenant's API data. The shared IAM Gateway API-key authentication path mishandles tenant association among concurrent requests, returning response data from a different tenant. Exploitation requires a valid Platform ONE IAM-issued API key and specific high-concurrency traffic; XIQ-native tokens and OAuth/Bearer JWTs are unaffected.

The record

CVE
CVE-2026-9831
Published
May 29, 2026
Updated
May 29, 2026
Vendor
Extreme Networks
Product
Extreme Platform ONE
Classifications
CWE-362, CWE-488
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <25.10.0-104

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Extreme Networks · Extreme Platform ONEversion=0 <25.10.0-104

Published CVSS scores

6.3Extreme NetworksCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-488Exposure of Data Element to Wrong Session

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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