CVE-2026-32173Network attack vector

Unauthenticated network information disclosure

Published Apr 2, 2026 · Updated Apr 2, 2026

Improper authentication in Microsoft Azure SRE Agent Gateway - SignalR Hub allows remote attackers to disclose information over a network. Microsoft identifies the SignalR Hub gateway as the affected locus but has not disclosed which authentication operation accepts an unauthenticated request or what data the request returns. No privileges or user interaction are required; the reported consequence is limited to confidentiality, with no integrity or availability impact.

CVSS severity8.6
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Microsoft Azure SRE Agent Gateway - SignalR Hub allows remote attackers to disclose information over a network. Microsoft identifies the SignalR Hub gateway as the affected locus but has not disclosed which authentication operation accepts an unauthenticated request or what data the request returns. No privileges or user interaction are required; the reported consequence is limited to confidentiality, with no integrity or availability impact.

The record

CVE
CVE-2026-32173
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, CWE-863
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.6Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-863Incorrect Authorization

Public exploit references

No public exploit references are available in this record.

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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