CSRF in Nagios Enterprises, Llc. Core
CVE-2026-48551
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.
Vulnerability class: CSRF (Cross-Site Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Nagios Enterprises, Llc. Core — versions 0
- Nagios Enterprises, Llc. Xi — versions 0
Weakness classification (CWE)
References
- www.nagios.com/security-disclosures/nagios-core/ (vendor-advisory, patch)
- github.com/NagiosEnterprises/nagioscore/blob/master/Changelog (release-notes)
- www.vulncheck.com/advisories/nagios-core-xi-csrf-protection-bypass-via-double-s… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-48551?
- CVE-2026-48551 is a high-severity vulnerability in Nagios Enterprises, Llc. Core, classified under Cross-Site Request Forgery (CSRF). CVSS score: 7.4/10. Published 2026-08-12.
- How severe is CVE-2026-48551?
- High severity. CVSS v3 base score is 7.4 out of 10.