Checkmk up to 2.5.0b3 Monitoring Quicksearch delimiter

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability has been found in Checkmk up to 2.5.0b3 and classified as critical. Affected by this vulnerability is an unknown functionality of the component Monitoring Quicksearch. The manipulation leads to delimiter. This vulnerability is uniquely identified as CVE-2026-33455. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Checkmk up to 2.5.0b3. This issue affects an unknown part of the component Monitoring Quicksearch. The manipulation with an unknown input leads to a delimiter vulnerability. Using CWE to declare the problem leads to CWE-140. The product does not neutralize or incorrectly neutralizes delimiters. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Livestatus injection in the monitoring quicksearch in Checkmk <2.5.0b4 allows an authenticated attacker to inject livestatus commands via the search query due to insufficient input sanitization in search filter plugins.

It is possible to read the advisory at checkmk.com. The identification of this vulnerability is CVE-2026-33455 since 03/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.5.0b4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1050). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Checkmk Checkmk

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Delimiter
CWE: CWE-140 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Checkmk 2.5.0b4

Timelineinfo

03/20/2026 CVE reserved
04/10/2026 +20 days Advisory disclosed
04/10/2026 +0 days VulDB entry created
04/10/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: checkmk.com
Status: Confirmed

CVE: CVE-2026-33455 (🔒)
GCVE (CVE): GCVE-0-2026-33455
GCVE (VulDB): GCVE-100-356807
CERT Bund: WID-SEC-2026-1050 - Checkmk: Mehrere Schwachstellen

Entryinfo

Created: 04/10/2026 11:24
Updated: 04/10/2026 13:44
Changes: 04/10/2026 11:24 (65), 04/10/2026 13:44 (7)
Complete: 🔍
Cache ID: 216::103

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