nagios4: Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi
CVE-2026-48549 is fixed in nagios4 on 1 platform, first by DEBIAN-CVE-2026-48549, released August 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nagios4 · Debian 12.15 (bookworm) | 4.4.6-4+deb12u2 | DEBIAN-CVE-2026-48549 | Aug 26, 2026 |
| nagios4 · Debian 13.5 (trixie) | 4.4.6-4.1+deb13u2 | DEBIAN-CVE-2026-48549 | Aug 26, 2026 |
| nagios4 · Debian 14 | 4.5.14+ds-1 | DEBIAN-CVE-2026-48549 | Aug 26, 2026 |
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