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    CVE-2026-15576

    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.

    Published:Aug 21, 2026
    Last Modified:Aug 21, 2026
    EPS:Aug 21, 2026
    EPSS Score:
    CVSS Score:6.9

    Affected Products

    Vendor
    Checkmk
    Product
    Checkmk

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-15937 (CVSS 5.3) — Improper certificate validation in Checkmk <2.5.0p10 allows a relay and a push agent that share the same UUID …
    CVE-2026-17548 (CVSS 5.3) — Missing authorization in Checkmk <2.5.0p12, <2.4.0p36, <2.3.0p50 and all 2.2.0 versions allows an authenticate…
    CVE-2026-7485 (CVSS 2.3) — Incorrect authorization in frozen BI aggregations in Checkmk <2.5.0p2, <2.4.0p29, <2.3.0p47, and all 2.2.0 ver…
    CVE-2026-15227 (CVSS 5.3) — Missing authorization in Checkmk <2.5.0p10, <2.4.0p35, <2.3.0p49, and 2.2.0 (EOL) allows an authenticated user…
    CVE-2026-8593 (CVSS 5.3) — Improper permission enforcement in Checkmk versions 2.5.0 before 2.5.0p9, 2.4.0 before 2.4.0p34, 2.3.0 before …
    CVE-2026-14852 (CVSS 5.2) — Privilege escalation in Checkmk versions 2.5.0 before 2.5.0p9, 2.4.0 before 2.4.0p34, 2.3.0 before 2.3.0p49, a…
    CVE-2026-9549 (CVSS 4.8) — Stored cross-site scripting in the service discovery active check output in Checkmk <2.5.0p5, <2.4.0p31, <2.3.…
    CVE-2026-8833 (CVSS 8.5) — Improper neutralization of HTML-encoded characters in the URL validation function in Checkmk <2.5.0p5, <2.4.0p…
    CVE-2026-8078 (CVSS 4.8) — Stored cross-site scripting in the global settings change log in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and a…
    CVE-2026-7765 (CVSS 6.3) — Incorrect authorization in the User Messages dashboard widget in Checkmk <2.5.0p5 causes the message-fetching …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High