fix: Rate limit is bypassed by sending request header X-Forwarded-For: 127.0.0.1 when Parse Server option trustProxy is permissive

[mtrezza]

Pull Request

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Issue

Rate limit is bypassed by sending request header X-Forwarded-For: 127.0.0.1 when Parse Server option trustProxy is permissive

Tasks

• Add tests
• Add changes to documentation (guides, repository pages, code comments)

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: 2aa5ebee-1757-4364-9f6d-b16d666c0d27

📥 Commits

Reviewing files that changed from the base of the PR and between c2f9b7b and 73058f3.

📒 Files selected for processing (2)

• spec/RateLimit.spec.js
• src/middlewares.js

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📝 Walkthrough

Walkthrough

Rate-limit exclusion now uses the raw loopback socket and forwarded-header state. Batch checks preserve these request fields. Tests cover forwarded, ambiguous, remote, batch, and genuine loopback requests.

Changes

Internal request rate-limit validation

Layer / File(s)	Summary
Internal request detection and rate-limit application src/middlewares.js, src/cloud-code/Parse.Cloud.js	Rate-limit exclusion requires a raw 127.0.0.1 socket and no X-Forwarded-For header. The trigger request documentation describes proxy-aware IP resolution through trustProxy.
Batch request context propagation src/batch.js	Synthetic batch requests pass the original socket and headers to rate-limit checks.
Rate-limit behavior tests spec/RateLimit.spec.js	Tests cover trusted proxies, forwarded and empty headers, remote peers, batch requests, and includeInternalRequests.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 73058

The rate-limit fix applies consistently to direct and batch requests. No remaining merge-blocking risk is identified.

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Caution

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

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❌ Failed checks (1 error, 1 warning)

Check name	Status	Explanation	Resolution
Description check	❌ Error	No pull request description was provided. The required Issue, Approach, and Tasks information is missing.	Add a pull request description that follows the repository template. Describe the issue, summarize the approach, and mark the applicable tasks as complete.
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Security Check	✅ Passed	No security vulnerability is introduced by the reviewed changes. The production diff replaces the spoofable request.ip === '127.0.0.1' exemption with a raw request.socket.remoteAddress check and r…
Engage In Review Feedback	✅ Passed	PASS. The review feedback was not ignored. CodeRabbit requested handling empty X-Forwarded-For values and adding regression tests. The author replied that the issue was fixed in commit 73058f37, c…
Title check	✅ Passed	The title begins with the allowed fix: prefix. The first letter after the prefix is capitalized, and the title accurately describes the rate-limit bypass fix.

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[coderabbitai]

Actionable comments posted: 1

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minimal, and validate.

Inline comments:
In `@src/middlewares.js`:
- Around line 665-679: Update isInternalRequest to reject any request containing
the x-forwarded-for header, including an empty value, by checking own-property
presence rather than header truthiness. Add a regression test covering an empty
X-Forwarded-For header on a loopback socket and preserve the existing behavior
for requests without the header.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: 729c3278-a0ab-4e03-a3fb-b5615e349159

📥 Commits

Reviewing files that changed from the base of the PR and between 6d92204 and c2f9b7b.

📒 Files selected for processing (4)

• spec/RateLimit.spec.js
• src/batch.js
• src/cloud-code/Parse.Cloud.js
• src/middlewares.js

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.82%. Comparing base (9b73e6f) to head (73058f3).
⚠️ Report is 1 commits behind head on alpha.

Additional details and impacted files

@@            Coverage Diff             @@
##            alpha   #10664      +/-   ##
==========================================
- Coverage   93.83%   93.82%   -0.02%     
==========================================
  Files         192      192              
  Lines       16866    16868       +2     
  Branches      252      252              
==========================================
  Hits        15826    15826              
- Misses       1018     1020       +2     
  Partials       22       22              

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[mtrezza]

@coderabbitai resolve

[coderabbitai]

✅ Action performed

Comments resolved and changes approved.

[parseplatformorg]

🎉 This change has been released in version 9.10.1-alpha.11