Fix security vulnerabilities reported by Dependabot

[AlexJerabek]

Summary

This PR addresses all open security vulnerabilities reported by Dependabot across the repository by adding npm package overrides to enforce secure versions of vulnerable dependencies.

Vulnerabilities Fixed

High Severity (2)

• ✅ serialize-javascript RCE (GHSA-5c6j-r48x-rmvq)
  • Vulnerability in RegExp.flags and Date.prototype.toISOString()
  • Fixed by upgrading to serialize-javascript ^7.0.5
  • Affected: 2 samples

Moderate Severity (76)

• ✅ uuid buffer bounds check (GHSA-w5hq-g745-h8pq)

  • Missing buffer bounds check in v3/v5/v6 when buf is provided
  • Fixed by upgrading to uuid ^14.0.0
  • Affected: 60+ samples

• ✅ webpack-dev-server source code theft (Multiple CVEs)

  • Source code may be stolen when accessing malicious websites
  • Fixed by upgrading to webpack-dev-server ^5.2.3
  • Affected: 4 samples

• ✅ jsdiff DoS (GHSA-73rr-hh4g-fpgx)

  • Denial of Service vulnerability in parsePatch and applyPatch
  • Fixed by upgrading to diff ^9.0.0
  • Affected: Multiple samples

• ⚠️ Showdown ReDoS (GHSA-rmmh-p597-ppvv)

  • Regular Expression Denial of Service in link/anchor parsing
  • No fix available - using latest version ^2.1.0
  • Affected: 2 samples (Outlook tutorial)

Low Severity (4)

• ✅ tmp symbolic link vulnerability (GHSA-52f5-9888-hmc6)
  • Arbitrary file/directory write via symbolic link
  • Fixed by upgrading to tmp ^0.2.5
  • Affected: 4 samples

Changes

1. Updated 76 package.json files with security overrides:

   "overrides": {
     "uuid": "^14.0.0",
     "diff": "^9.0.0",
     "serialize-javascript": "^7.0.5",
     "tmp": "^0.2.5"
   }

2. Created missing package.json for powerpoint-hello-world sample

3. Added automation scripts:

   • fix-vulnerabilities.js - Script to update all package.json files with security overrides
   • install-all.js - Script to install dependencies across all samples

Testing

• ✅ Verified npm audit shows 0 vulnerabilities in multiple samples:
  • excel-shared-runtime-scenario
  • powerpoint-hello-world
  • office-contextual-tabs
  • word-citation-management
• ✅ Confirmed no breaking changes in dependency resolution
• 🔄 CI build tests will validate all samples build correctly

Note on Showdown Vulnerability

The Showdown ReDoS vulnerability (GHSA-rmmh-p597-ppvv) has no fix available in any version, including the latest (2.1.0). This is a known limitation and affects only the Outlook tutorial sample. The risk is low as it's a development-time dependency used for markdown rendering in a specific tutorial.

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