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    CVE-2025-39663

    Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).

    Published:Oct 30, 2025
    Last Modified:Dec 3, 2025
    EPS:Oct 30, 2025
    EPSS Score:0.00058
    CVSS Score:8.4

    Affected Products

    Vendor
    Checkmk
    Product
    Checkmk

    Exploits

    https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scriptinghttp://seclists.org/fulldisclosure/2025/Nov/0https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting

    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-2026-15576 (CVSS 6.9) — Improper authentication in the agent receiver of Checkmk <2.5.0p10 allows an unauthenticated remote attacker t…
    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…

    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