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Nagios Core CVE-2026-48551

| EUVDEUVD-2026-57326 MEDIUM
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-08-12 VulnCheck GHSA-4f3c-j3m4-8h7h
CSRF Nagios Core Nagios Xi Suse
6.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:H/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
7.4 HIGH

Network-based CSRF with no attacker privileges; mandatory victim interaction (UI:R); scope change (S:C) and high subsequent-system integrity impact reflect unauthorized command execution as legitimate admin.

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

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 12, 2026 - 17:08 vuln.today
CVE Published
Aug 12, 2026 - 16:32 cve.org
MEDIUM 6.1

DescriptionCVE.org

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.

AnalysisAI

Cross-site request forgery protection bypass in Nagios Core (before 4.5.14) and Nagios XI (before 2026R1.7) allows unauthenticated remote attackers to execute monitoring commands with the privileges of authenticated users by exploiting a flawed double-submit cookie implementation. The CSRF defense can be entirely circumvented by supplying self-crafted, matching cookie and request parameter values - no server-validated token is required - enabling command execution via maliciously crafted links sent to authenticated administrators. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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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 an authenticated Nagios Core or Nagios XI user with sufficient privileges to execute the targeted command (e.g., administrator or operator role). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N) scores 6.1, reflecting that no attacker privileges are needed and complexity is low, but active victim interaction (UI:A) is a hard prerequisite. … 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 4.5.14 or later and Nagios XI to version 2026R1.7 or later; patch availability is confirmed by 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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Same technique CSRF

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Vendor StatusVendor

SUSE

Severity: Important

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CVE-2026-48551 vulnerability details – vuln.today
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