CVE-2026-48548: Cross-Site Request Forgery (CSRF) in Nagios Enterprises, LLC. Nagios Core
Description
Nagios Core versions before 4.5.12 have a cross-site request forgery (CSRF) vulnerability in the cmd.cgi component. The CSRF protection mechanism incorrectly validates requests even when the NagFormId cookie is missing. This flaw allows attackers to craft malicious cross-site POST requests that execute arbitrary Nagios commands with the privileges of an authenticated user without their knowledge.
CVSS v4.0
Score 6.9medium
Affected software
Nagios Enterprises, LLC.
Nagios Core
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-48548 describes a CSRF vulnerability in Nagios Core prior to version 4.5.12. The vulnerability arises because the CSRF protection mechanism in cmd.cgi passes validation if the NagFormId cookie is absent. Exploiting this, an attacker can send a crafted cross-site POST request that executes arbitrary commands in Nagios Core as the currently authenticated user, potentially leading to unauthorized command execution.
Potential Impact
An attacker can execute arbitrary Nagios commands with the privileges of an authenticated user without their consent, potentially leading to unauthorized actions within the Nagios Core monitoring environment. This could disrupt monitoring operations or alter configurations depending on the commands executed.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vulnerability affects versions before 4.5.12, upgrading to version 4.5.12 or later is likely recommended once official guidance is available. Until then, users should monitor vendor communications for patches or workarounds.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-05-21T18:34:46.418Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8f0bdbacd9273b4917decc
Added to database: 08/26/2026, 15:52:59 UTC
Last enriched: 09/10/2026, 10:24:59 UTC
Last updated: 10/09/2026, 06:48:17 UTC
Views: 47
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