CVE-2026-48551
Nagios Core / XI CSRF Protection Bypass via Double-Submit Cookie
- State
- Published
- Severity
- 6.1 Medium
- Published
- Aug 12, 2026
- Updated
- Aug 14, 2026
- Reserved
- May 21, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | VulnCheck |
| 3.1 | 7.4 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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-protection-bypass-via-double-submit-cookiethird-party-advisory
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