CVE-2024-38858Network attack vector

Browser script execution via unsandboxed HTML logs

Published Sep 2, 2024 · Updated Sep 3, 2024

Stored cross-site scripting in Checkmk 2.3.0 through 2.3.0p13 allows attackers to run JavaScript through crafted Robotmk HTML logs. The Robotmk logs view renders host-generated HTML without a sandbox, allowing embedded script to access the surrounding Checkmk site. An attacker needs access to the monitored host, and a Checkmk user must display the poisoned log; the script then executes in that user's browser context.

CVSS severity2.3
Low
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Checkmk 2.3.0 through 2.3.0p13 allows attackers to run JavaScript through crafted Robotmk HTML logs. The Robotmk logs view renders host-generated HTML without a sandbox, allowing embedded script to access the surrounding Checkmk site. An attacker needs access to the monitored host, and a Checkmk user must display the poisoned log; the script then executes in that user's browser context.

The record

CVE
CVE-2024-38858
Published
Sep 2, 2024
Updated
Sep 3, 2024
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2024Record 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=2.3.0 <2.3.0p14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Checkmk GmbH · Checkmkversion=2.3.0 <2.3.0p14

Published CVSS scores

2.3Checkmk GmbHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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