CVE-2026-17548Network attack vector

Authenticated job-result disclosure via unchecked job identifiers

Published Aug 25, 2026 · Updated Aug 25, 2026

Missing authorization in affected Checkmk releases allows remote authenticated users to read other users’ background-job status and results. The background-job status and results handler accepts a supplied job ID and returns matching job data without verifying that the requester may view that job. A valid account and known job ID are required; predictable IDs expose some jobs in 2.5.0 before 2.5.0p12, 2.4.0 before 2.4.0p36, 2.3.0 before 2.3.0p50, and all 2.2.0 versions.

CVSS severity5.3
Medium
EPSS probability0.21%
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 affected Checkmk releases allows remote authenticated users to read other users’ background-job status and results. The background-job status and results handler accepts a supplied job ID and returns matching job data without verifying that the requester may view that job. A valid account and known job ID are required; predictable IDs expose some jobs in 2.5.0 before 2.5.0p12, 2.4.0 before 2.4.0p36, 2.3.0 before 2.3.0p50, and all 2.2.0 versions.

The record

CVE
CVE-2026-17548
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-862, CAPEC-122, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=2.2.0
  2. Affected versionversion=2.3.0 <2.3.0p50
  3. Affected versionversion=2.4.0 <2.4.0p36
  4. Affected versionversion=2.5.0 <2.5.0p12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=2.2.0; version=2.3.0 <2.3.0p50; version=2.4.0 <2.4.0p36; version=2.5.0 <2.5.0p12

Published CVSS scores

5.3Checkmk GmbHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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 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
CAPEC-122Privilege Abuse
T1213Data from Information Repositories

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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