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CVE-2026-48549

Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie

MEDIUM
6.5
CVSS Score
Published: August 26, 2026 at 03:37 PM UTC
Updated: September 24, 2026 at 08:57 PM UTC
4 products affected across 2 vendorsNagios XINagios CoreNagios XI

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi. When no Cookie header is present, the double-submit cookie protection can be bypassed by supplying matching NagFormId and nagFormId values in the POST body, allowing a cross-site request to execute Nagios commands as a currently authenticated user.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nagios Core· Nagios
95%
v < 4.5.13
Affected range stops below 4.5.13, so it looks safe — our inference, not a vendor statement
Nagios XI· Nagios
95%
v < 2026R1.5
Affected range stops below 2026R1.5, so it looks safe — our inference, not a vendor statement
Nagios Core· Nagios Enterprises
60%
v < 4.5.13
Affected range stops below 4.5.13, so it looks safe — our inference, not a vendor statement
Nagios XI· Nagios Enterprises
60%
v < 2026R1.5
Affected range stops below 2026R1.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor AdvisoryPatch
Source: cverecord
https://www.nagios.com/security-disclosures/nagios-core/
Release Notes
Source: cverecord
https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/nagios-core-xi-csrf-via-cmd-cgi-double-submit-cookie

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-352

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