Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie (CVE-2026-48549) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-48549

Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie

Answer in brief

CVE-2026-48549 records a Unknown severity vulnerability in Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie. The current sources do not mark it as known exploited. The current feed maps Nagios Enterprises, LLC./Nagios Core (generic), Nagios Enterprises, LLC./Nagios XI (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Nagios Enterprises, LLC./Nagios Core (generic), Nagios Enterprises, LLC./Nagios XI (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Nagios Enterprises, LLC./Nagios Coregeneric	>=0 <4.5.13	4.5.13
Nagios Enterprises, LLC./Nagios XIgeneric	>=0 <2026R1.5	2026R1.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for Nagios Enterprises, LLC./Nagios Core, Nagios Enterprises, LLC./Nagios XI.
Review the reported fix. Update Nagios Enterprises, LLC./Nagios Core to 4.5.13; Nagios Enterprises, LLC./Nagios XI to 2026R1.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.