Vulnerability Description
Improper neutralization of newlines in filter values in the monitoring host and service list APIs in Checkmk <2.5.0p14 allows an authenticated user to inject additional Livestatus query headers, bypassing object visibility restrictions in count queries to infer information about hosts and services outside their contact groups and occupying web server and Livestatus workers for an attacker-controlled duration.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-90990?
CVE-2026-90990 is a documented vulnerability. Improper neutralization of newlines in filter values in the monitoring host and service list APIs in Checkmk <2.5.0p14 allows an authenticated user to inject additional Livestatus query headers, bypas...
How severe is CVE-2026-90990?
CVSS scoring is not yet available for CVE-2026-90990. Check NVD for updates.
Is there a patch for CVE-2026-90990?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.