Checkmk up to 2.4.0p25/2.5.0b3 Notification Test Page delimiter

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Checkmk up to 2.4.0p25/2.5.0b3. This impacts an unknown function of the component Notification Test Page. Performing a manipulation results in delimiter. This vulnerability is known as CVE-2026-33456. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Checkmk up to 2.4.0p25/2.5.0b3. This affects an unknown functionality of the component Notification Test Page. The manipulation with an unknown input leads to a delimiter vulnerability. CWE is classifying the issue as CWE-140. The product does not neutralize or incorrectly neutralizes delimiters. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Livestatus injection in the notification test mode in Checkmk <2.5.0b4 and <2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description.

The advisory is shared at checkmk.com. This vulnerability is uniquely identified as CVE-2026-33456 since 03/20/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. Neither technical details nor an exploit are publicly available.

Upgrading to version 2.4.0p26 or 2.5.0b4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1050). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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: 4.7
VulDB Meta Temp Score: 4.5

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
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 2.4.0p26/2.5.0b4

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-2026-33456 (🔒)
GCVE (CVE): GCVE-0-2026-33456
GCVE (VulDB): GCVE-100-356805
CERT Bund: WID-SEC-2026-1050 - Checkmk: Mehrere Schwachstellen

Entryinfo

Created: 04/10/2026 11:23
Updated: 04/10/2026 13:44
Changes: 04/10/2026 11:23 (65), 04/10/2026 13:44 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

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