diff --git a/src/domain/cve-enrichment.ts b/src/domain/cve-enrichment.ts
index ac20c26..1970a0c 100644
--- a/src/domain/cve-enrichment.ts
+++ b/src/domain/cve-enrichment.ts
@@ -83,6 +83,12 @@ export function cveIdFromRuleId(value: string | undefined): string | null {
   return value ? normalizeCveId(value) : null;
 }
 
+/** Derives the public MITRE CWE detail page for a `CWE-<number>` weakness id, or null for non-CWE ids. */
+export function cweDetailUrl(weaknessId: string): string | null {
+  const match = /^CWE-(\d+)$/i.exec(weaknessId.trim());
+  return match ? `https://cwe.mitre.org/data/definitions/${match[1]}.html` : null;
+}
+
 export function cveEnrichmentValidationErrors(record: CveEnrichmentRecord): string[] {
   const errors: string[] = [];
   if (normalizeCveId(record.cveId) !== record.cveId) errors.push('CVE ID must be normalized.');
diff --git a/src/features/project-import/canonical-model-to-dataset.ts b/src/features/project-import/canonical-model-to-dataset.ts
index 17add01..b790b33 100644
--- a/src/features/project-import/canonical-model-to-dataset.ts
+++ b/src/features/project-import/canonical-model-to-dataset.ts
@@ -5,7 +5,7 @@ import { makeSheet } from '../../importers/sheet-factory';
 import { stableSheetId } from '../../shared/identifiers';
 import { groupProjectImportFiles } from './datahub-import-groups';
 import type { CveAffectedConfiguration, CveConfigurationMatch, CveEnrichmentRecord } from '../../domain/cve-enrichment';
-import { cveIdFromRuleId } from '../../domain/cve-enrichment';
+import { cveIdFromRuleId, cweDetailUrl } from '../../domain/cve-enrichment';
 import { canonicalSecurityScores } from '../../scoring/canonical-security-score';
 import { defaultSecurityScoringPolicy } from '../../domain/security-scoring';
 
@@ -111,9 +111,11 @@ export function cveFieldsForDisplay(record: CveEnrichmentRecord): OriginalField[
     '| --- | --- | ---: | --- | --- |',
     ...record.metrics.map(metric => `| ${markdownCell(metric.version)} | ${markdownCell(metric.source)} | ${metric.baseScore} | ${markdownCell(metric.baseSeverity ?? '')} | ${markdownCell(metric.vector)} |`)
   ].join('\n') : '');
-  add('nvd-weaknesses', 'NVD Weaknesses', record.weaknesses.map(item =>
-    `- ${item.id}${item.description ? ` — ${item.description}` : ''} (${item.source})`
-  ).join('\n'));
+  add('nvd-weaknesses', 'NVD Weaknesses', record.weaknesses.map(item => {
+    const url = cweDetailUrl(item.id);
+    const label = url ? `[${markdownCell(item.id)}](${url})` : markdownCell(item.id);
+    return `- ${label}${item.description ? ` — ${markdownCell(item.description)}` : ''} (${markdownCell(item.source)})`;
+  }).join('\n'));
   add('nvd-references', 'NVD References', record.references.length ? [
     '| Reference | Source | Tags |',
     '| --- | --- | --- |',
diff --git a/src/features/results-browser/ResultsBrowser.tsx b/src/features/results-browser/ResultsBrowser.tsx
index af3f363..e3198d1 100644
--- a/src/features/results-browser/ResultsBrowser.tsx
+++ b/src/features/results-browser/ResultsBrowser.tsx
@@ -8,6 +8,7 @@ import { browserDownloadAdapter } from '../../platform/browser/browser-download-
 import { downloadText } from '../../exports/text-download';
 import { buildUnifiedResultJsonl, queryAllUnifiedResults, unifiedResultJsonlFileName } from '../../exports/unified-result-jsonl';
 import { hasSelectedTimeslotScope } from '../../app/work-scope';
+import { cweDetailUrl } from '../../domain/cve-enrichment';
 
 const assessorApi = new AssessorApiClient();
 const PAGE_SIZE = 50;
@@ -273,7 +274,13 @@ function ResultRow({ item, expanded, onToggle, onUpdated }: {
             <li>Metrics: {item.cveEnrichment.metrics.map(metric =>
               `CVSS ${metric.version} ${metric.baseScore}${metric.baseSeverity ? ` ${metric.baseSeverity}` : ''} (${metric.source})`
             ).join(' · ') || 'Not supplied'}</li>
-            <li>Weaknesses: {item.cveEnrichment.weaknesses.map(weakness => weakness.id).join(', ') || 'Not supplied'}</li>
+            <li>Weaknesses: {item.cveEnrichment.weaknesses.length ? item.cveEnrichment.weaknesses.map((weakness, index) => {
+              const url = cweDetailUrl(weakness.id);
+              return <span key={`${weakness.id}-${index}`}>
+                {index > 0 ? ', ' : ''}
+                {url ? <a href={url} target="_blank" rel="noreferrer">{weakness.id}</a> : weakness.id}
+              </span>;
+            }) : 'Not supplied'}</li>
           </ul>
           {item.cveEnrichment.references.length > 0 && <details>
             <summary>Advisories, solutions, and tools ({item.cveEnrichment.references.length.toLocaleString('en-US')})</summary>
diff --git a/src/scoring/canonical-security-score.ts b/src/scoring/canonical-security-score.ts
index cd9a302..047869a 100644
--- a/src/scoring/canonical-security-score.ts
+++ b/src/scoring/canonical-security-score.ts
@@ -19,7 +19,7 @@ function scoreObservation(item: EnvironmentObservation): EnvironmentObservation
 
 export function securityToolId(value: string): string {
   const normalized = value.toLowerCase().replace(/[^a-z0-9]/g, '');
-  return ({ purpleknight: 'purple-knight', pingcastle: 'pingcastle', ciscat: 'cis-cat', ciscatpro: 'cis-cat', maester: 'maester', gpos: 'group-policy', gpoanalysis: 'group-policy', grouppolicy: 'group-policy' } as Record<string, string>)[normalized] ?? value.toLowerCase();
+  return ({ purpleknight: 'purple-knight', pingcastle: 'pingcastle', ciscat: 'cis-cat', ciscatpro: 'cis-cat', maester: 'maester', gpos: 'group-policy', gpoanalysis: 'group-policy', grouppolicy: 'group-policy', defenderforiotvulnerabilities: 'defender-for-iot', microsoftdefenderforiot: 'defender-for-iot' } as Record<string, string>)[normalized] ?? value.toLowerCase();
 }
 
 function valueOf(item: EnvironmentObservation): JsonValue {
diff --git a/tests/domain/cwe-detail-url.test.ts b/tests/domain/cwe-detail-url.test.ts
new file mode 100644
index 0000000..e7c28cc
--- /dev/null
+++ b/tests/domain/cwe-detail-url.test.ts
@@ -0,0 +1,17 @@
+import { describe, expect, it } from 'vitest';
+import { cweDetailUrl } from '../../src/domain/cve-enrichment';
+
+describe('CWE detail URL derivation', () => {
+  it('links a CWE-<number> id to its MITRE definition page', () => {
+    expect(cweDetailUrl('CWE-119')).toBe('https://cwe.mitre.org/data/definitions/119.html');
+    expect(cweDetailUrl('cwe-79')).toBe('https://cwe.mitre.org/data/definitions/79.html');
+    expect(cweDetailUrl(' CWE-89 ')).toBe('https://cwe.mitre.org/data/definitions/89.html');
+  });
+
+  it('returns null for non-CWE weakness ids', () => {
+    expect(cweDetailUrl('NVD-CWE-noinfo')).toBeNull();
+    expect(cweDetailUrl('NVD-CWE-Other')).toBeNull();
+    expect(cweDetailUrl('CWE-119 extra')).toBeNull();
+    expect(cweDetailUrl('')).toBeNull();
+  });
+});