CVE catalog
CVE-2026-15576
UBUNTU-CVE-2026-15576
- Severity
- Unknown
- Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.45% · Oct 25, 2026
Improper authentication in the agent receiver of Checkmk <2.5.0p10 allows an unauthenticated remote attacker to bypass mutual TLS client certificate verification of relay endpoints by supplying a fixed placeholder identity in the request URL, resulting in limited impact on integrity and availability. Only the Cloud, Ultimate and Ultimate MT editions are affected, as other editions do not expose relay endpoints.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Ubuntu | check-mk | pro | 1.2.6p5-1 | vulnerable |
| Ubuntu | check-mk | pro | 1.2.6p12-1 | vulnerable |
| Ubuntu | check-mk | pro | 1.2.6p12-1ubuntu0.16.04.1 | vulnerable |
| Ubuntu | check-mk | pro | 1.2.6p12-1ubuntu0.16.04.1+esm1 | vulnerable |
| Ubuntu | check-mk | 18.04 | 1.2.8p16-1ubuntu0.1 | vulnerable |
| Ubuntu | check-mk | 18.04 | 1.2.8p16-1ubuntu0.2 | vulnerable |
Fixed-version evidence
OpenFactory catalog packages
No matching packages in this catalog.
Observed: