Is CVE-2026-48551 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-48551?

CVE-2026-48551 has a CVSS v3 severity of HIGH (7.4).

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CVE-2026-48551

Description

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.