CVE-2023-23548Network attack vector

Session script execution via unescaped BI parameter

Published Aug 1, 2023 · Updated Sep 27, 2024

Reflected XSS in Checkmk 1.6.0 through 1.6.0p30 and before 2.0.0p38, 2.1.0p32, or 2.2.0p8 allows remote attackers to run script. The wato.py BI aggregations route reflects the bulk_moveto query parameter into its response without escaping HTML or JavaScript. Exploitation requires another BI pack besides the default and a legitimate user to click a prepared link, placing the script in that user's valid session.

CVSS severity5.4
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Checkmk 1.6.0 through 1.6.0p30 and before 2.0.0p38, 2.1.0p32, or 2.2.0p8 allows remote attackers to run script. The wato.py BI aggregations route reflects the bulk_moveto query parameter into its response without escaping HTML or JavaScript. Exploitation requires another BI pack besides the default and a legitimate user to click a prepared link, placing the script in that user's valid session.

The record

CVE
CVE-2023-23548
Published
Aug 1, 2023
Updated
Sep 27, 2024
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-79, CWE-80, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 27, 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=1.6.0 <=1.6.0p30
  2. Affected versionversion=2.0.0 <2.0.0p38
  3. Affected versionversion=2.1.0 <2.1.0p32
  4. Affected versionversion=2.2.0 <2.2.0p8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=1.6.0 <=1.6.0p30; version=2.0.0 <2.0.0p38; version=2.1.0 <2.1.0p32; version=2.2.0 <2.2.0p8

Published CVSS scores

5.4Checkmk GmbHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1203Exploitation for Client Execution

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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