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    CVE-2026-48551

    Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 contain a cross-site request forgery protection bypass via a self-supplied double-submit cookie. An attacker can supply matching cookie and request parameter values to bypass CSRF protection, enabling unauthenticated attackers to run commands as authorized users via malicious links.

    Published:Aug 12, 2026
    Last Modified:Aug 14, 2026
    EPS:Aug 12, 2026
    EPSS Score:0.00173
    CVSS Score:7.4

    Affected Products

    Vendor
    Nagios
    Product
    Nagios Core
    Vendor
    Nagios
    Product
    Nagios Xi

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-48549 (CVSS 6.9) — Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi. When no Cook…
    CVE-2026-48548 (CVSS 6.9) — Nagios Core before 4.5.12 contains a cross-site request forgery vulnerability in cmd.cgi where the CSRF protec…
    CVE-2026-48554 (CVSS 7.7) — Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to authenticated remote code execution …
    CVE-2026-48553 (CVSS 7.7) — Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 are vulnerable to authenticated remote code execution …
    CVE-2026-48552 (CVSS 5.1) — Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to DOM-based cross-site scripting in js…
    CVE-2026-48550 (CVSS 5.1) — Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to reflected cross-site scripting in cm…
    CVE-2020-35269 (CVSS 8.8) — Nagios Core application version 4.2.4 is vulnerable to Site-Wide Cross-Site Request Forgery (CSRF) in many fun…
    CVE-2018-18245 (CVSS 5.4) — Nagios Core 4.4.2 has XSS via the alert summary reports of plugin results, as demonstrated by a SCRIPT element…
    CVE-2018-13457 (CVSS 5.5) — qh_echo in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows at…
    CVE-2018-13458 (CVSS 5.5) — qh_core in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows at…

    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