Checkmk up to 2.2.0/2.3.0p47/2.4.0p30/2.5.0p4 Activate Changes Page cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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2.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Checkmk up to 2.2.0/2.3.0p47/2.4.0p30/2.5.0p4. It has been declared as problematic. This issue affects some unknown processing of the component Activate Changes Page. The manipulation results in cross site scripting. This vulnerability is identified as CVE-2026-8078. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Checkmk up to 2.2.0/2.3.0p47/2.4.0p30/2.5.0p4. It has been classified as problematic. Affected is some unknown processing of the component Activate Changes Page. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

Stored cross-site scripting in the global settings change log in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can change global settings to store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or Audit log.

The advisory is available at checkmk.com. This vulnerability is traded as CVE-2026-8078 since 05/07/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation needs additional levels of successful authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 320346 (Linux Distros Unpatched Vulnerability : CVE-2026-8078), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.3.0p48, 2.4.0p31 or 2.5.0p5 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (320346), EUVD (EUVD-2026-35052) and CERT Bund (WID-SEC-2026-1817). If you want to get best quality of vulnerability data, you may have to visit 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: 2.4
VulDB Meta Temp Score: 2.3

VulDB Base Score: 2.4
VulDB Temp Score: 2.3
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: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
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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Nessus ID: 320346
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-8078

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Checkmk 2.3.0p48/2.4.0p31/2.5.0p5

Timelineinfo

05/07/2026 CVE reserved
06/08/2026 +32 days Advisory disclosed
06/08/2026 +0 days VulDB entry created
06/10/2026 +2 days VulDB entry last update

Sourcesinfo

Advisory: checkmk.com
Status: Confirmed

CVE: CVE-2026-8078 (🔒)
GCVE (CVE): GCVE-0-2026-8078
GCVE (VulDB): GCVE-100-369186
EUVD: 🔒
CERT Bund: WID-SEC-2026-1817 - Checkmk: Mehrere Schwachstellen erm&ouml;glichen Cross-Site Scripting

Entryinfo

Created: 06/08/2026 15:17
Updated: 06/10/2026 15:18
Changes: 06/08/2026 15:17 (66), 06/08/2026 17:31 (1), 06/09/2026 11:55 (7), 06/10/2026 15:18 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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