Medium
Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-48550
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:10 UTC · Revision 1
Source evidence
Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter
core-osv · Original sourcePublished 12 Aug 2026, 16:30 UTC
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.
osv:CVE-2026-48550
Complete source record
{
"id": "ac8ddcb8c007b8a5379d118269f0a00b8a39b6d831a3a0ece125f2043d07756d",
"url": "https://osv.dev/vulnerability/CVE-2026-48550",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter",
"summary": "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.",
"evidence": "osv:CVE-2026-48550",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-48550",
"aliases": [
"CVE-2026-48550"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nagiosenterprises/nagioscore",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "cfa5684eb50facc3183d5ddb01d853b9eb9cc218"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "4.5.14"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "4.5.14"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"nagios-4.5.13",
"nagios-4.5.12",
"nagios-4.5.11",
"nagios-4.5.10",
"nagios-4.5.9",
"nagios-4.5.8",
"nagios-4.5.7",
"nagios-4.5.6",
"nagios-4.5.5",
"nagios-4.5.4",
"nagios-4.5.3",
"nagios-4.5.2",
"nagios-4.5.1",
"nagios-4.5.0",
"nagios-4.4.14",
"nagios-4.4.13",
"nagios-4.4.12",
"nagios-4.4.11",
"nagios-4.4.10",
"nagios-4.4.9",
"nagios-4.4.8",
"nagios-4.4.7",
"nagios-4.4.6",
"nagios-4.4.5",
"nagios-4.4.4",
"nagios-4.4.3",
"nagios-4.4.3rc1",
"nagios-4.4.1",
"nagios-4.4.0",
"nagios-4.3.4",
"nagios-4.3.3",
"nagios-4.3.2",
"nagios-4.3.1",
"release-4.3.0",
"nagios-4.3.0",
"release-4.2.4",
"nagios-4.2.2",
"4.2.1",
"nagios-4.1.1",
"nagios-4.1.0",
"nagios-4.1.0rc2",
"nagios-4.0.6",
"nagios-4.0.5",
"nagios-4.0.4",
"nagios-4.0.0",
"nagios-4.0.0-beta4",
"nagios-4.0.0-beta3",
"nagios-4.0.0-beta2",
"nagios-4.0.0-beta1",
"nagios-3.4.1",
"nagios-3.4.0",
"nagios-3.3.1",
"nagios-3.2.3",
"nagios-3.2.2",
"nagios-3.2.1",
"nagios-3.2.0",
"nagios-3.1.2",
"nagios-3.1.1",
"nagios-3.1.0",
"nagios-3.0.6",
"nagios-3.0.5",
"nagios-3.0.4",
"nagios-3.0.3",
"nagios-3.0.2",
"nagios-3.0.1",
"nagios-3.0",
"nagios-3.0rc3",
"nagios-3.0rc2",
"nagios-3.0rc1",
"nagios-3.0b7",
"nagios-3.0b6",
"nagios-3.0b5",
"nagios-3.0b4",
"nagios-3.0b3",
"nagios-3.0b2",
"nagios-3.0b1",
"nagios-3.0a5",
"nagios-3.0a4",
"nagios-3.0a3",
"nagios-3.0a2",
"nagios-3.0a1",
"nagios-2.0",
"nagios-2.0rc1",
"nagios-2.0b6",
"nagios-2.0.b5",
"nagios-2.0b4",
"nagios-2.0b3",
"nagios-2.0b2",
"nagios-2.0b1",
"nagios-1.0b6",
"nagios-1.0b5",
"nagios-1.0b4",
"nagios-1.0b3",
"nagios-1.0b2",
"nagios-1.0b1",
"nagios-1.0a7",
"nagios-1.0a6"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48550.json"
}
}
],
"modified": "2026-10-28T02:30:29.349072515Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48550.json",
"https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog",
"https://nvd.nist.gov/vuln/detail/CVE-2026-48550",
"https://www.vulncheck.com/advisories/nagios-core-xi-cmd-cgi-reflected-xss-via-nagformid-parameter",
"https://www.nagios.com/security-disclosures/nagios-core/"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "VulnCheck",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "2026R1.7"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48550.json"
}
},
"related_cves": [
{
"value": "CVE-2026-48550",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496239,
"published_at": "2026-08-12T16:30:02.409+00:00"
}