CVE-2026-23517Network attack vector

Diagnostic disclosure and profiling DoS via non-admin access

Published Jan 21, 2026 · Updated Jan 21, 2026

Missing authorization in Fleet Device Management Fleet debug endpoints allows remote authenticated users to read diagnostics and interrupt service. The debugAuthenticationMiddleware accepts sessions for users able to perform actions without requiring the global Administrator role. Observer access therefore reaches runtime profiles and in-memory state and can start CPU-intensive profiling that exhausts server resources.

CVSS severity8.1
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Fleet Device Management Fleet debug endpoints allows remote authenticated users to read diagnostics and interrupt service. The debugAuthenticationMiddleware accepts sessions for users able to perform actions without requiring the global Administrator role. Observer access therefore reaches runtime profiles and in-memory state and can start CPU-intensive profiling that exhausts server resources.

The record

CVE
CVE-2026-23517
Published
Jan 21, 2026
Updated
Jan 21, 2026
Vendor
Fleet Device Management
Product
Fleet
Classifications
CWE-862, T1190, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 21, 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=< 4.53.3
  2. Affected versionversion=>= 4.75.0, < 4.75.2
  3. Affected versionversion=>= 4.76.0, < 4.76.2
  4. Affected versionversion=>= 4.77.0, < 4.77.1
  5. Affected versionversion=>= 4.78.0, < 4.78.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fleet Device Management · Fleetversion=< 4.53.3; version=>= 4.75.0, < 4.75.2; version=>= 4.76.0, < 4.76.2; version=>= 4.77.0, < 4.77.1; version=>= 4.78.0, < 4.78.3

Published CVSS scores

6.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
8.1NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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 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-862Missing Authorization
T1190Exploit Public-Facing Application
T1499Endpoint Denial of Service

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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