CVE-2026-90990
Livestatus injection via monitoring filter values
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 22, 2026
- Updated
- Sep 22, 2026
- Reserved
- Sep 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N | Checkmk |
Weaknesses
- CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
Affected Products
| Product | Versions |
|---|---|
CheckmkCheckmk GmbH |
|
References
- https://checkmk.com/werk/19604vendor-advisory
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