CVE-2026-90990
mediumpriority · track · 0EPSS 0.004 · 36 %ileDEEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.3–5.3
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (8)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-3485Checkmk: Mehrere SchwachstellenDeutsch2026-09-20csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Checkmk ausnutzen, um Sicherheitsvorkehrungen zu umgehen, und um Daten zu manipulieren.
sources
Which sources assert this record, and when.
references (1) nvd
External citations — patches, advisories, analysis.
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