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Nagios Core CVE-2026-48548

| EUVDEUVD-2026-66598 MEDIUM
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-08-26 VulnCheck GHSA-5xj4-4632-2x3r
CSRF Nagios Core Nagios Enterprises Llc
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.5 MEDIUM

Network-delivered CSRF with no attacker privileges (PR:N), mandatory victim interaction (UI:R), integrity-only impact; scope unchanged as commands run within Nagios only.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 26, 2026 - 16:58 vuln.today
CVE Published
Aug 26, 2026 - 15:33 cve.org
MEDIUM 6.9

DescriptionCVE.org

Nagios Core before 4.5.12 contains a cross-site request forgery vulnerability in cmd.cgi where the CSRF protection mechanism passes validation when the NagFormId cookie is absent. Attackers can craft a malicious cross-site POST request to execute arbitrary Nagios commands as a currently authenticated user without their knowledge or consent.

AnalysisAI

Cross-site request forgery in Nagios Core before 4.5.12 enables remote attackers to execute arbitrary monitoring commands by tricking an authenticated administrator into visiting a malicious page. The flaw in cmd.cgi stems from a logic inversion: the CSRF protection mechanism treats an absent NagFormId cookie as a passing check rather than a failing one, rendering the protection entirely ineffective. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The victim must be currently authenticated to Nagios Core with an active browser session and must be induced to visit or load a page under the attacker's control that triggers a cross-origin POST to cmd.cgi. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 with vector AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N reflects moderate-to-elevated real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary fix is to upgrade Nagios Core to version 4.5.12 or later, which corrects the CSRF validation logic so that an absent NagFormId cookie causes validation to fail rather than pass. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-48548 vulnerability details – vuln.today
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