CVE-2026-48549
Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 26, 2026
- Updated
- Aug 28, 2026
- Reserved
- May 21, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N | VulnCheck |
Weaknesses
- CWE-352 Cross-Site Request Forgery (CSRF)
Affected Products
| Product | Versions |
|---|---|
Nagios CoreNagios Enterprises, LLC. |
|
Nagios XINagios Enterprises, LLC. |
|
References
- Security Disclosuresvendor-advisorypatch
- Changelogrelease-notes
- https://www.vulncheck.com/advisories/nagios-core-xi-csrf-via-cmd-cgi-double-submit-cookiethird-party-advisory
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