Stored cross-site scripting in the service discovery active check output in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can configure active or custom checks to inject malicious HTML or JavaScript into check output that executes in the browser of an admin or a user with host read permissions when they run the check on the service discovery page.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 4.8, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required . The vulnerability impacts limited data confidentiality, limited integrity, for affected systems. Impacting 1 product from checkmk organizations running these solutions should prioritize assessment and patching.
Reported in 2026, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2026-06-08T13:16:34.030
2026-07-23T07:10:00.113
Analyzed
CVSSv3.1: 4.8 (MEDIUM)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.2.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.3.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.4.0 | Yes |
| Application | checkmk | checkmk | 2.5.0 | Yes |
| Application | checkmk | checkmk | 2.5.0 | Yes |
| Application | checkmk | checkmk | 2.5.0 | Yes |
| Application | checkmk | checkmk | 2.5.0 | Yes |
| Application | checkmk | checkmk | 2.5.0 | Yes |
| Application | checkmk | checkmk | 2.5.0 | Yes |
| Application | checkmk | checkmk | 2.5.0 | Yes |
| Application | checkmk | checkmk | 2.5.0 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For checkmk's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.