CVE-2022-46836Public exploitNetwork attack vector

Authenticated PHP execution via incomplete string escaping

Published Feb 20, 2023 · Updated Aug 3, 2024

PHP code injection in Checkmk allows remote authenticated users to execute arbitrary PHP through crafted WATO profile data. The watolib formatter escapes single quotes but not preceding backslashes, so a backslash-quote sequence breaks out of a generated PHP string in auth.php or hosttags.php. Successful exploitation requires GUI access to change profile settings and a request to NagVis; affected releases are 1.6.0 through 1.6.0p29, 2.0.0 through 2.0.0p27, and 2.1.0 through 2.1.0p10.

CVSS severity9.1
Critical
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP code injection in Checkmk allows remote authenticated users to execute arbitrary PHP through crafted WATO profile data. The watolib formatter escapes single quotes but not preceding backslashes, so a backslash-quote sequence breaks out of a generated PHP string in auth.php or hosttags.php. Successful exploitation requires GUI access to change profile settings and a request to NagVis; affected releases are 1.6.0 through 1.6.0p29, 2.0.0 through 2.0.0p27, and 2.1.0 through 2.1.0p10.

The record

CVE
CVE-2022-46836
Published
Feb 20, 2023
Updated
Aug 3, 2024
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-20, CWE-94, CAPEC-242, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 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=1.6.0 <=1.6.0p29
  2. Affected versionversion=2.0.0 <=2.0.0p27
  3. Affected versionversion=2.1.0 <=2.1.0p10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=1.6.0 <=1.6.0p29; version=2.0.0 <=2.0.0p27; version=2.1.0 <=2.1.0p10

Published CVSS scores

9.1Checkmk GmbHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-94Improper Control of Generation of Code ('Code Injection')
CAPEC-242Code Injection
T1059Command and Scripting Interpreter

Public exploit references

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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