diff --git a/agent/internal/security/status.go b/agent/internal/security/status.go
index e66480d197..c569bd9e54 100644
--- a/agent/internal/security/status.go
+++ b/agent/internal/security/status.go
@@ -101,6 +101,11 @@ func defaultDataDir() string {
 func providerFromName(name string) string {
 	lower := strings.ToLower(strings.TrimSpace(name))
 	switch {
+	// Elastic Defend (Elastic Agent / Elastic Endpoint Security) registers with
+	// Windows Security Center. Match before the broad "defender" case so an
+	// "Elastic Defender"-style name isn't misread as Microsoft Defender (#2018).
+	case strings.Contains(lower, "elastic"):
+		return "elastic_defend"
 	case strings.Contains(lower, "defender"):
 		return "windows_defender"
 	case strings.Contains(lower, "bitdefender"):
diff --git a/agent/internal/security/status_provider_test.go b/agent/internal/security/status_provider_test.go
new file mode 100644
index 0000000000..8447aaf6b7
--- /dev/null
+++ b/agent/internal/security/status_provider_test.go
@@ -0,0 +1,31 @@
+package security
+
+import "testing"
+
+func TestProviderFromName(t *testing.T) {
+	cases := []struct {
+		name     string
+		display  string
+		expected string
+	}{
+		{"microsoft defender", "Windows Defender", "windows_defender"},
+		{"sentinelone", "SentinelOne", "sentinelone"},
+		{"crowdstrike", "CrowdStrike Falcon", "crowdstrike"},
+		{"elastic defend", "Elastic Defend", "elastic_defend"},
+		{"elastic endpoint security", "Elastic Endpoint Security", "elastic_defend"},
+		{"elastic agent", "Elastic Agent", "elastic_defend"},
+		// Locks the elastic-before-defender ordering: an "Elastic Defender"-style
+		// name must not fall through to the broad "defender" → windows_defender case.
+		{"elastic defender", "Elastic Defender", "elastic_defend"},
+		{"unknown product", "Acme Shield", "other"},
+		{"empty", "", "other"},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := providerFromName(tc.display); got != tc.expected {
+				t.Fatalf("providerFromName(%q) = %q, want %q", tc.display, got, tc.expected)
+			}
+		})
+	}
+}
diff --git a/apps/api/migrations/2026-07-05-security-provider-elastic-defend.sql b/apps/api/migrations/2026-07-05-security-provider-elastic-defend.sql
new file mode 100644
index 0000000000..7409afb232
--- /dev/null
+++ b/apps/api/migrations/2026-07-05-security-provider-elastic-defend.sql
@@ -0,0 +1,5 @@
+-- Recognize Elastic Defend as a first-class antivirus provider.
+-- Previously WSC-reported Elastic agents normalized to 'other', so AV-coverage
+-- detection treated Elastic Defend-protected devices as unprotected (#2018).
+-- Insert before 'other' to keep the catch-all value last in the enum order.
+ALTER TYPE security_provider ADD VALUE IF NOT EXISTS 'elastic_defend' BEFORE 'other';
diff --git a/apps/api/src/db/schema/security.ts b/apps/api/src/db/schema/security.ts
index 9ea8c91a1d..2e8863d34b 100644
--- a/apps/api/src/db/schema/security.ts
+++ b/apps/api/src/db/schema/security.ts
@@ -24,6 +24,7 @@ export const securityProviderEnum = pgEnum('security_provider', [
   'malwarebytes',
   'eset',
   'kaspersky',
+  'elastic_defend',
   'other'
 ]);
 
diff --git a/apps/api/src/routes/agents/helpers.provider.test.ts b/apps/api/src/routes/agents/helpers.provider.test.ts
new file mode 100644
index 0000000000..37f2f99f5c
--- /dev/null
+++ b/apps/api/src/routes/agents/helpers.provider.test.ts
@@ -0,0 +1,42 @@
+import { describe, expect, it, vi } from 'vitest';
+
+// helpers.ts (and its transitive imports) load the db module at import; stub it
+// so this pure-function test doesn't spin up a real pool (green-local/red-CI trap).
+vi.mock('../../db', () => ({
+  db: {},
+  runOutsideDbContext: vi.fn((fn: () => unknown) => fn()),
+  withDbAccessContext: vi.fn(async (_ctx: unknown, fn: () => Promise<unknown>) => fn()),
+  withSystemDbAccessContext: vi.fn(async (fn: () => Promise<unknown>) => fn())
+}));
+
+import { normalizeProvider } from './helpers';
+import { securityProviderValues } from './schemas';
+import { providerCatalog } from '../security/schemas';
+
+describe('normalizeProvider — Elastic Defend (#2018)', () => {
+  it('maps Elastic Defend variants to elastic_defend', () => {
+    expect(normalizeProvider('elastic_defend')).toBe('elastic_defend');
+    expect(normalizeProvider('elastic_endpoint')).toBe('elastic_defend');
+    expect(normalizeProvider('elastic_agent')).toBe('elastic_defend');
+    expect(normalizeProvider('elastic')).toBe('elastic_defend');
+    // Case-insensitive, matching the existing provider handling.
+    expect(normalizeProvider('Elastic_Defend')).toBe('elastic_defend');
+  });
+
+  it('still normalizes known providers and unknowns', () => {
+    expect(normalizeProvider('crowdstrike')).toBe('crowdstrike');
+    expect(normalizeProvider('acme-shield')).toBe('other');
+    expect(normalizeProvider(null)).toBe('other');
+  });
+
+  it('keeps the provider sources in sync (dashboard indexes providerCatalog[normalizeProvider(x)])', () => {
+    // elastic_defend must be an accepted ingest value...
+    expect(securityProviderValues).toContain('elastic_defend');
+    // ...and resolvable in the catalog, or dashboard provider labeling throws.
+    expect(providerCatalog.elastic_defend).toEqual({
+      id: 'elastic_defend',
+      name: 'Elastic Defend',
+      vendor: 'Elastic'
+    });
+  });
+});
diff --git a/apps/api/src/routes/agents/helpers.ts b/apps/api/src/routes/agents/helpers.ts
index a4b5817040..d4135c100c 100644
--- a/apps/api/src/routes/agents/helpers.ts
+++ b/apps/api/src/routes/agents/helpers.ts
@@ -217,6 +217,11 @@ export function normalizeProvider(raw: unknown): SecurityProviderValue {
       return 'eset';
     case 'kaspersky':
       return 'kaspersky';
+    case 'elastic_defend':
+    case 'elastic_endpoint':
+    case 'elastic_agent':
+    case 'elastic':
+      return 'elastic_defend';
     default:
       return 'other';
   }
diff --git a/apps/api/src/routes/agents/schemas.ts b/apps/api/src/routes/agents/schemas.ts
index cd7dd4e470..2b8eb2f526 100644
--- a/apps/api/src/routes/agents/schemas.ts
+++ b/apps/api/src/routes/agents/schemas.ts
@@ -258,6 +258,7 @@ export const securityProviderValues = [
   'malwarebytes',
   'eset',
   'kaspersky',
+  'elastic_defend',
   'other'
 ] as const;
 
diff --git a/apps/api/src/routes/security/schemas.ts b/apps/api/src/routes/security/schemas.ts
index df262859a6..f9b06de8cd 100644
--- a/apps/api/src/routes/security/schemas.ts
+++ b/apps/api/src/routes/security/schemas.ts
@@ -10,6 +10,7 @@ export const providerCatalog = {
   malwarebytes: { id: 'malwarebytes', name: 'Malwarebytes', vendor: 'Malwarebytes' },
   eset: { id: 'eset', name: 'ESET', vendor: 'ESET' },
   kaspersky: { id: 'kaspersky', name: 'Kaspersky', vendor: 'Kaspersky' },
+  elastic_defend: { id: 'elastic_defend', name: 'Elastic Defend', vendor: 'Elastic' },
   other: { id: 'other', name: 'Other', vendor: 'Other' }
 } as const;
 
diff --git a/apps/api/src/services/securityComplianceReport.test.ts b/apps/api/src/services/securityComplianceReport.test.ts
index 99be3e0e8c..65ff43e0af 100644
--- a/apps/api/src/services/securityComplianceReport.test.ts
+++ b/apps/api/src/services/securityComplianceReport.test.ts
@@ -85,6 +85,24 @@ describe('generateSecurityCompliancePostureReport', () => {
     expect((r.summary as any).controls.unprotectedCount).toBe(2);
   });
 
+  it('counts an Elastic Defend device with RTP on as AV-covered, not unprotected (#2018)', async () => {
+    mockGeneratorQueries({
+      // dev-1: Huntress-managed (#5). dev-2: native Elastic Defend with RTP on.
+      // dev-3: no security_status row → unprotected.
+      3: [
+        { deviceId: 'dev-2', provider: 'elastic_defend', realTimeProtection: true, definitionsDate: new Date(), encryptionStatus: 'encrypted', firewallEnabled: true, passwordPolicySummary: { minLength: 12, lockoutThreshold: 5 }, localAdminSummary: { adminCount: 1 } }
+      ]
+    });
+    const r = await generateSecurityCompliancePostureReport(ORG, { sites: [] });
+    const c = (r.summary as any).controls;
+    // Before the fix, elastic_defend normalized to 'other' → dev-2 would be
+    // unprotected (anyAv 33%). Recognized as native AV it joins dev-1 in coverage.
+    expect(c.anyAvCoveragePct).toBe(67);
+    expect(c.unprotectedCount).toBe(1);
+    const byHost = Object.fromEntries((r.rows as any[]).map((x) => [x.hostname, x]));
+    expect(byHost['pc-2'].protection).toMatch(/Elastic Defend/i);
+  });
+
   it('computes control percentages from security_status', async () => {
     mockGeneratorQueries();
     const r = await generateSecurityCompliancePostureReport(ORG, {});
diff --git a/apps/api/src/services/securityComplianceReport.ts b/apps/api/src/services/securityComplianceReport.ts
index 198694eff3..145220233f 100644
--- a/apps/api/src/services/securityComplianceReport.ts
+++ b/apps/api/src/services/securityComplianceReport.ts
@@ -69,7 +69,8 @@ function prettyProvider(p: string): string {
     sophos: 'Sophos',
     malwarebytes: 'Malwarebytes',
     eset: 'ESET',
-    kaspersky: 'Kaspersky'
+    kaspersky: 'Kaspersky',
+    elastic_defend: 'Elastic Defend'
   };
   return map[p] ?? p;
 }