Skip to main content

Nagios Core/XI CVE-2026-48549

| EUVDEUVD-2026-66599 MEDIUM
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-08-26 VulnCheck GHSA-xm5q-p2r5-r5wj
CSRF Nagios Core Nagios Xi
6.9
CVSS 4.0 · Vendor: VulnCheck
Share

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. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Persist
technique details hidden
Impact
technique details hidden
Sign in to reveal

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.
Sign in to read full assessment

Threat intelligence, references, and detailed analysis are available after sign-in.

More in Nagios Core

View all
CVE-2018-13458 MEDIUM POC
5.5 Jul 12

qh_core in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to
CVE-2018-13457 MEDIUM POC
5.5 Jul 12

qh_echo in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to
CVE-2018-18245 MEDIUM POC
5.4 Dec 17

Nagios Core 4.4.2 has XSS via the alert summary reports of plugin results, as demonstrated by a SCRIPT element delivered
CVE-2020-35269 HIGH
8.8 Dec 23

Nagios Core application version 4.2.4 is vulnerable to Site-Wide Cross-Site Request Forgery (CSRF) in many functions, li
CVE-2017-14312 HIGH
7.8 Sep 11

Nagios Core through 4.3.4 initially executes /usr/sbin/nagios as root but supports configuration options in which this f
CVE-2026-48554 HIGH
7.7 Aug 12

Remote code execution in Nagios Core (before 4.5.14) and Nagios XI (before 2026R1.7) allows authenticated UI users to ru
CVE-2026-48553 HIGH
7.7 Aug 12

Authenticated remote code execution in Nagios Core (before 4.5.13) and Nagios XI (before 2026R1.5) is achievable via OS

CVE-2026-48548 MEDIUM
6.9 Aug 26

Cross-site request forgery in Nagios Core before 4.5.12 enables remote attackers to execute arbitrary monitoring command
CVE-2026-48551 MEDIUM
6.1 Aug 12

Cross-site request forgery protection bypass in Nagios Core (before 4.5.14) and Nagios XI (before 2026R1.7) allows unaut
CVE-2026-48552 MEDIUM
5.1 Aug 12

DOM-based cross-site scripting in Nagios Core (before 4.5.14) and Nagios XI (before 2026R1.7) allows an authenticated lo
CVE-2026-48550 MEDIUM
5.1 Aug 12

Reflected cross-site scripting in Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 allows unauthenticated remote

Same weakness CWE-352 – Cross-Site Request Forgery (CSRF)

View all
CVE-2016-6277 HIGH POC
8.8
CVE-2014-100005 HIGH POC
8.0
CVE-2013-5696 MEDIUM POC
6.8
CVE-2020-36836 HIGH POC
8.0
CVE-2015-2295 MEDIUM POC
6.8
CVE-2016-6897 MEDIUM POC
6.5
CVE-2022-41622 HIGH POC
8.8
CVE-2025-2907 CRITICAL POC
9.8

Same technique CSRF

View all
CVE-2016-6277 HIGH POC
8.8
CVE-2014-100005 HIGH POC
8.0
CVE-2017-9757 HIGH POC
8.8
CVE-2013-5696 MEDIUM POC
6.8
CVE-2013-4152 MEDIUM POC
6.8
CVE-2024-7094 CRITICAL
9.8
CVE-2015-4624 HIGH POC
7.5
CVE-2020-36836 HIGH POC
8.0

Share

CVE-2026-48549 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy