Vulnerability DatabaseCVE-2026-48549
Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2026-48549
Published:August 26, 2026
Updated:September 24, 2026
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.
Affected Packages
https://github.com/NagiosEnterprises/nagioscore.git (GITHUB):
Affected version(s) >=nagios-1.0 <nagios-4.5.13
Fix Suggestion:
Update to version nagios-4.5.13
Related Resources (5)
https://www.vulncheck.com/advisories/nagios-core-xi-csrf-via-cmd-cgi-double-submit-cookie
https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
https://nvd.nist.gov/vuln/detail/CVE-2026-48549
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48549.json
https://www.nagios.com/security-disclosures/nagios-core/
Do you need more information?
Contact Us
CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
ACTIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Cross-Site Request Forgery (CSRF)
CWE-352
EPSS
Base Score:
0.17