CVE-2026-48551
CVE-2026-48551 · Nagios Core / XI CSRF Protection Bypass via Double-Submit Cookie
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.1 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
nagios core
- Versions
- ≥ 0, < 4.5.14: Affected (semver)
Update to 4.5.14
nagios xi
- Versions
- ≥ 0, < 2026R1.7: Affected (custom)
Update to 2026R1.7
nagios4 Debian:12
- Versions
- 4.4.6-4
- 4.4.6-4+deb12u1
- Affected ranges
- ECOSYSTEM: < 4.4.6-4+deb12u2
Update to 4.4.6-4+deb12u2
nagios4 Debian:13
- Versions
- 4.4.6-4.1
- 4.4.6-4.1+deb13u1
- Affected ranges
- ECOSYSTEM: < 4.4.6-4.1+deb13u2
Update to 4.4.6-4.1+deb13u2
nagios4 Debian:14
- Versions
- 4.4.6-4.1
- 4.5.12+ds-1
- Affected ranges
- ECOSYSTEM: < 4.5.14+ds-1
Update to 4.5.14+ds-1
nagios4 Ubuntu:20.04:LTS
- Versions
- 4.3.4-3
- 4.3.4-3ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nagios4 Ubuntu:22.04:LTS
- Versions
- 4.4.6-4
- 4.4.6-4ubuntu0.22.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nagios4 Ubuntu:24.04:LTS
- Versions
- 4.4.6-4
- 4.4.6-4ubuntu0.24.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nagios4 Ubuntu:26.10
- Versions
- 4.4.6-4.1ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nagios4 Ubuntu:26.04:LTS
- Versions
- 4.4.6-4.1ubuntu1
- 4.4.6-4.1ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published