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Nagios Core CVE-2026-48550

| EUVDEUVD-2026-57324 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-08-12 VulnCheck GHSA-hc96-98mh-7j3h
XSS Nagios Core Nagios Xi Suse
5.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

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

Network-delivered reflected XSS with no attacker privileges; scope changes to victim browser; user interaction required; no availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
SUSE
6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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 12, 2026 - 17:07 vuln.today
CVE Published
Aug 12, 2026 - 16:30 cve.org
MEDIUM 5.1

DescriptionCVE.org

Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to reflected cross-site scripting in cmd.cgi via the NagFormId parameter. An unauthenticated remote attacker can craft a malicious link that, when followed by an authenticated user, executes arbitrary JavaScript in the victim's browser.

AnalysisAI

Reflected cross-site scripting in Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 allows unauthenticated remote attackers to execute arbitrary JavaScript in the browser of an authenticated victim. The injection point is the NagFormId parameter in cmd.cgi, which is insufficiently sanitized before being reflected in server responses. …

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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 attacker requires no authentication and no special privileges - the malicious URL is crafted externally and requires zero access to the Nagios server. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.1 (Medium) reflects the fundamental constraint of this vulnerability: it requires active user interaction (UI:A), meaning the victim must click a malicious link while authenticated. … 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, 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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Vendor StatusVendor

SUSE

Severity: Moderate

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CVE-2026-48550 vulnerability details – vuln.today
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