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TI-2026-35910 Aliases CVE-2026-48551GHSA-4f3c-j3m4-8h7h

Nagios Core / XI CSRF Protection Bypass via Double-Submit Cookie

Priority LOW 27CWE-352Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Tampering
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-352.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00264 18th percentileScored 2026-11-07
Fix Fixed Nagios Core (Nagios Enterprises, LLC.): 4.5.14Nagios XI (Nagios Enterprises, LLC.): 2026R1.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Nagios Enterprises, LLC.Nagios Corebefore 4.5.144.5.14Patch availableCNA
Nagios Enterprises, LLC.Nagios XIbefore 2026R1.72026R1.7Patch availableCNA

Remediation

  • Fix · CNA Nagios Core (Nagios Enterprises, LLC.) Fixed in 4.5.14
  • Fix · CNA Nagios XI (Nagios Enterprises, LLC.) Fixed in 2026R1.7

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Nagios Core, Nagios XI 2026R1.7, 4.5.14

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-35913 Nagios Core / XI Authenticated RCE via Unfiltered NOTIFICATION-Family Macro SubstitutionPriority LOW 38
    • TI-2026-35909 Nagios Core / XI cmd.cgi Reflected XSS via NagFormId ParameterPriority LOW 24
    • TI-2026-35911 Nagios Core / XI DOM-based XSS via jsonquery.jsPriority LOW 23
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48551
  2. 2026-10-03 Alias added: GHSA-4f3c-j3m4-8h7h

References

Patch 1

Other 1

  • TI-2012-05452 Nagios XI Network Monitor Graph Explorer Component < 1.3 Authenticated Command Injection CVSS 4.0HIGH 8.6
  • TI-2026-84257 OS command injection in Nagios XI via MIB upload CVSS 4.0HIGH 8.6
  • TI-2026-35913 Nagios Core / XI Authenticated RCE via Unfiltered NOTIFICATION-Family Macro Substitution CVSS 4.0HIGH 7.7
  • TI-2026-35912 Nagios Core / XI Authenticated RCE via Custom-Variable Macro Injection CVSS 4.0HIGH 7.7
  • TI-2026-35908 Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie CVSS 4.0MEDIUM 6.9
  • TI-2026-35907 Nagios Core CSRF via cmd.cgi CVSS 4.0MEDIUM 6.9
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences