CVE catalog

CVE-2026-48550

nagios4: CVE-2026-48550

Severity: Medium · CVSS 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Aug 12, 2026, 5:17:27 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.44% · Oct 25, 2026

Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to reflected cross-site scripting in cmd.cgi via the NagFormId parameter. An unauthenticated remote attacker can craft a malicious link that, when followed by an authenticated user, executes arbitrary JavaScript in the victim's browser.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	nagios4	sid	`4.5.14+ds-1`	fixed
Debian	nagios4	forky	`4.5.14+ds-1`	fixed
Debian	nagios4	trixie	`4.4.6-4.1+deb13u1`	vulnerable
Debian	nagios4	trixie-security	`4.4.6-4.1+deb13u2`	fixed
Debian	nagios4	bookworm	`4.4.6-4+deb12u1`	vulnerable
Debian	nagios4	bookworm-security	`4.4.6-4+deb12u2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	nagios4	source	sid	`4.5.14+ds-1`	not yet assigned	Not reported	[1144495]
Debian	nagios4	source	forky	`4.5.14+ds-1`	not yet assigned	Not reported	[1144495]
Debian	nagios4	source	trixie	`4.4.6-4.1+deb13u2`	not yet assigned	Not reported	[1144495]
Debian	nagios4	source	bookworm	`4.4.6-4+deb12u2`	not yet assigned	Not reported	[1144495]

[Debian bug #1144495]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[nagios4]Affected
Details (4)
- 4.4.6-4+deb12u1 · amd64 · bookworm
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · arm64 · bookworm
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · amd64 · bookworm-security
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · arm64 · bookworm-security
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
[nagios4-cgi]Affected
Source package: [nagios4]
Details (4)
- 4.4.6-4+deb12u1 · amd64 · bookworm
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · arm64 · bookworm
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · amd64 · bookworm-security
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · arm64 · bookworm-security
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
[nagios4-common]Affected
Source package: [nagios4]
Details (4)
- 4.4.6-4+deb12u1 · all · bookworm
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · all · bookworm
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · all · bookworm-security
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · all · bookworm-security
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
[nagios4-core]Affected
Source package: [nagios4]
Details (4)
- 4.4.6-4+deb12u1 · amd64 · bookworm
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · arm64 · bookworm
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · amd64 · bookworm-security
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm
- 4.4.6-4+deb12u1 · arm64 · bookworm-security
  Affected · Fixed: 4.4.6-4+deb12u2
  dsa · nagios4 · debian · bookworm

Observed: Oct 27, 2026, 7:10:10 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)]