fix: Create CLP not enforced before user field validation on signup

[mtrezza]

Issue

User enumeration via signup when create CLP is disabled

Tasks

• Add new feature
• Add breaking change
• Fix a bug
• Improve existing feature
• Improve code quality
• Improve test suite
• Improve documentation

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[coderabbitai]

📝 Walkthrough

Walkthrough

Added a new vulnerability test suite for user enumeration via signup endpoint, along with corresponding implementation to enforce class-level create permissions earlier in the RestWrite execution flow to prevent information leakage.

Changes

Cohort / File(s)	Summary
User Enumeration Vulnerability Tests spec/vulnerabilities.spec.js	Added test suite (GHSA-4m9m-p9j9-5hjw) with helper function updateCLP() and three test cases validating that disabled public create permissions prevent username/email enumeration and that enabled permissions still enforce duplicate detection.
Create Permission Validation src/RestWrite.js	Added validateCreatePermission() async method to RestWrite.prototype.execute() that validates class-level create permissions immediately after schema initialization, before user transformation, short-circuiting for non-public creates and master/maintenance auth.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request has no description provided, missing all required template sections including Issue, Approach, and Tasks checkboxes.	Add a detailed description following the template: include the security issue reference (GHSA-4m9m-p9j9-5hjw), explain the approach taken in RestWrite.js and vulnerabilities.spec.js, and check off completed tasks (tests added, security check added).
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title accurately describes the main fix: enforcing create CLP earlier in the signup flow to prevent user enumeration.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.53%. Comparing base (e8cc676) to head (60afe9b).
⚠️ Report is 15 commits behind head on alpha.

Files with missing lines	Patch %	Lines
src/RestWrite.js	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            alpha   #10268      +/-   ##
==========================================
- Coverage   92.54%   92.53%   -0.01%     
==========================================
  Files         192      192              
  Lines       16435    16442       +7     
  Branches      226      226              
==========================================
+ Hits        15209    15215       +6     
- Misses       1206     1207       +1     
  Partials       20       20              

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[parseplatformorg]

🎉 This change has been released in version 9.6.0-alpha.51

[parseplatformorg]

🎉 This change has been released in version 9.6.0