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Nagios Core/XI EUVDEUVD-2026-66599

| CVE-2026-48549 MEDIUM
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-08-26 VulnCheck GHSA-xm5q-p2r5-r5wj
CSRF Nagios Xi 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-reachable CSRF requiring authenticated victim interaction (UI:R, PR:N); integrity-only impact on Nagios commands; no scope change or confidentiality/availability effect.

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 - 15:37 cve.org
MEDIUM 6.9

DescriptionCVE.org

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.

AnalysisAI

Cross-site request forgery in Nagios Core (before 4.5.13) and Nagios XI (before 2026R1.5) allows an attacker to execute arbitrary Nagios commands on behalf of an authenticated user by exploiting a bypass in the double-submit cookie CSRF protection implemented in cmd.cgi. When the Cookie header is absent in a POST request, the server's CSRF check can be satisfied simply by supplying matching NagFormId and nagFormId values in the POST body - a condition entirely within the attacker's control. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Delivery
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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation The victim must be currently authenticated to the Nagios web interface in the same browser session at the time the cross-site request is triggered - exploitation depends entirely on the victim holding an active Nagios session. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N) scores at 6.9, reflecting a network-reachable, low-complexity attack requiring active user interaction but carrying high integrity impact. … 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 Upgrade Nagios Core to version 4.5.13 or later, and Nagios XI to version 2026R1.5 or later, per the vendor advisory at https://www.nagios.com/security-disclosures/nagios-core/. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-352 – Cross-Site Request Forgery (CSRF)

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EUVD-2026-66599 vulnerability details – vuln.today
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