CVE-2025-59273Public exploitNetwork attack vector

Cross-tenant subscription disclosure via incomplete scope filtering

Published Oct 23, 2025 · Updated Oct 23, 2025

Improper access control in Microsoft Azure Event Grid allows remote attackers to read other tenants' event subscription data over a network. The system-topic display path filters management-group-scoped subscriptions by a customer-chosen group ID without also enforcing the tenant boundary. A conflicting management group ID and a PolicyInsights system topic expose subscription metadata, delivery endpoints, linked identities, and unmasked delivery secrets.

CVSS severity7.3
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Microsoft Azure Event Grid allows remote attackers to read other tenants' event subscription data over a network. The system-topic display path filters management-group-scoped subscriptions by a customer-chosen group ID without also enforcing the tenant boundary. A conflicting management group ID and a PolicyInsights system topic expose subscription metadata, delivery endpoints, linked identities, and unmasked delivery secrets.

The record

CVE
CVE-2025-59273
Published
Oct 23, 2025
Updated
Oct 23, 2025
Vendor
Microsoft
Product
Azure Event Grid
Classifications
CWE-284, T1580
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 2025Record 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=N/A

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Azure Event Gridversion=N/A

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1580Cloud Infrastructure Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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