[mguptahub]

Summary

AppScan DAST remediation for SECUR-236 (plane-ee counterpart: makeplane/plane-ee#8591). This PR was trimmed to its unique, non-overlapping fixes after two parts were found to fully overlap existing open PRs against preview:

• per_page non-positive → 400 is covered identically by fix(api): return 400 for non-positive per_page instead of 500 #9429 — dropped here.
• password sign-in/sign-up rate limiting is covered (more cleanly, via a decorator) by [WEB-7946] fix: add rate limiting to email/password sign-in and sign-up endpoints #9335 (WEB-7946) — dropped here.

What remains in this PR

🟠 MEDIUM + 🟡 LOW — grouped-paginator cursor bound (not addressed by #9429)
GroupedOffsetPaginator takes its per-group page size from the client cursor.value, not the capped limit. cursor=1000000:0:0 → up to 1M rows/group (bypasses max_per_page, DoS; reachable unauthenticated on public boards); cursor=-1:0:0 → negative queryset slice → ValueError → HTTP 500. Fix bounds the parsed cursor (0 <= value <= max_per_page, offset >= 0) centrally in paginate(). Regression tests: TestCursorBounds.

🟡 LOW — Project mass-assignment
ProjectSerializer (fields="__all__") left created_by/updated_by client-writable; BaseModel.save() only backfills created_by when None, so a supplied value survived — allowing ownership/attribution forgery. Fix: add them to read_only_fields.

Testing

• Reproduced both cursor issues on a live plane-ce instance; TestCursorBounds covers reject (-1:0:0, 1001:0:0, 20:-1:0) + valid/at-max cursors.
• ruff lint + format clean.
• Grouped and sub-grouped paginators now size each group's page by per_page (as OffsetPaginator already does); TestGroupedPageSize covers this against a real issue queryset.
• TestAuditFieldsReadOnly covers project, cycle and view partial updates; EstimatePointSerializer audit fields are read-only too.

Note

Merge order: this PR's per_page/auth coverage now lives in #9429 and #9335 respectively — those should land for full SECUR-236 coverage on CE.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes

  • Improved pagination reliability by rejecting invalid, out-of-range, and negative pagination parameters.
  • Prevented malformed cursors from affecting pagination results or causing server errors.

• Security

  • Prevented client requests from modifying server-managed audit fields on projects, cycles, and issue views.
  • Added safeguards to ensure creator and updater information remains accurate and cannot be forged.

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[makeplane]

Linked to Plane Work Item(s)

References

• (WEB-7946) Add rate limiting to email/password sign-in and sign-up endpoints (GHSA-349j-pjw5-67q4)

This comment was auto-generated by Plane

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📝 Walkthrough

The serializers now protect server-managed audit fields from client assignment. BasePaginator now rejects negative page sizes and validates cursor bounds before paginator construction. Tests cover both mass-assignment and pagination validation.

Changes: Audit-field protection

Layer / File(s)	Summary
Serializer audit-field contracts apps/api/plane/app/serializers/project.py, apps/api/plane/app/serializers/cycle.py, apps/api/plane/app/serializers/view.py	The serializers mark created_by and updated_by as read-only fields.
Mass-assignment regression coverage apps/api/plane/tests/unit/serializers/test_mass_assignment.py	Tests verify that client-supplied audit-field values are excluded from validated data and are not persisted.

Pagination validation

Layer / File(s)	Summary
Paginator input validation apps/api/plane/utils/paginator.py	BasePaginator uses a shared effective page-size calculation and raises ParseError for negative per_page values and invalid cursor bounds.
Paginator validation coverage apps/api/plane/tests/unit/utils/test_paginator.py	Tests cover invalid and accepted cursor values, negative per_page values, and zero per_page values.

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

Suggested reviewers: dheeru0198, pablohashescobar

Merge Risk: 🟡 Moderate · up to 33977

The PR hardens grouped pagination and project attribution, but per_page=0 still causes paginated endpoints to fail with HTTP 500. That bounded correctness issue should be fixed or explicitly handled before merge.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 19.23% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 8 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly identifies the grouped-paginator cursor fix and Project mass-assignment fix. It is concise and directly related to the main changes.
Description check		The description is detailed and covers the changes, testing, overlapping references, and merge context. It does not use the template headings exactly, does not select a Type of Change, and does not in…

Full details: Description check

Explanation

The description is detailed and covers the changes, testing, overlapping references, and merge context. It does not use the template headings exactly, does not select a Type of Change, and does not include a dedicated Screenshots and Media section. These omissions do not prevent understanding the pull request.

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[coderabbitai]

Actionable comments posted: 2

🧹 Nitpick comments (2)

apps/api/plane/authentication/rate_limit.py (1)

52-76: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

No test coverage for the new account throttle.

This PR adds 17 paginator unit tests but nothing exercises AuthenticationAccountThrottle.get_cache_key (email vs. no-email fallback, normalization) or authentication_account_throttle_allows. Given this is security-critical brute-force protection, a few focused unit tests (cache-key bucketing by normalized email, fallback to IP when email absent, allow/deny across the rate window) would be valuable.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@apps/api/plane/authentication/rate_limit.py` around lines 52 - 76, Add
focused unit tests for AuthenticationAccountThrottle.get_cache_key covering
normalized email bucketing, distinct emails, and IP fallback when email is
absent; also test authentication_account_throttle_allows across the configured
rate window to verify initial requests are allowed and excess requests are
denied.

apps/api/plane/authentication/views/app/email.py (1)

33-48: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Extract the duplicated throttle-check-and-redirect block into a shared helper. The same 16-line pattern (call authentication_throttle_allows + authentication_account_throttle_allows, build a RATE_LIMIT_EXCEEDED AuthenticationException, and safe-redirect) is copy-pasted across all four sign-in/sign-up handlers. A single helper (e.g. in rate_limit.py, parameterized by is_app/is_space) would remove the duplication and prevent future drift in this security-critical gating logic.

• apps/api/plane/authentication/views/app/email.py#L33-L48: replace with a call to a shared authentication_rate_limit_redirect(request, next_path, is_app=True) helper that returns None or the redirect.
• apps/api/plane/authentication/views/app/email.py#L158-L172: same replacement, is_app=True.
• apps/api/plane/authentication/views/space/email.py#L32-L47: same replacement, is_space=True.
• apps/api/plane/authentication/views/space/email.py#L133-L147: same replacement, is_space=True.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@apps/api/plane/authentication/views/app/email.py` around lines 33 - 48,
Extract the duplicated authentication throttle check and RATE_LIMIT_EXCEEDED
redirect into a shared authentication_rate_limit_redirect helper, parameterized
for app or space redirects and returning None when allowed. In
apps/api/plane/authentication/views/app/email.py lines 33-48 and 158-172,
replace each block with the helper using is_app=True; in
apps/api/plane/authentication/views/space/email.py lines 32-47 and 133-147,
replace each with is_space=True.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@apps/api/plane/authentication/rate_limit.py`:
- Around line 52-69: Update AuthenticationAccountThrottle.get_cache_key so an
attacker cannot exhaust a victim’s throttle bucket solely by submitting the
victim’s email; derive the key from server-validated identity when available, or
combine the normalized email with the client identity. Preserve email
normalization and the existing IP fallback for requests without an email.
- Around line 63-64: Validate AUTHENTICATION_ACCOUNT_RATE_LIMIT before assigning
or using it in the authentication account throttle, ensuring it contains exactly
a numeric request count and a supported period in the expected “count/period”
format. Fall back to the existing default rate when the environment value is
empty or malformed, so AuthenticationAccountThrottle initialization remains safe
for every auth request.

---

Nitpick comments:
In `@apps/api/plane/authentication/rate_limit.py`:
- Around line 52-76: Add focused unit tests for
AuthenticationAccountThrottle.get_cache_key covering normalized email bucketing,
distinct emails, and IP fallback when email is absent; also test
authentication_account_throttle_allows across the configured rate window to
verify initial requests are allowed and excess requests are denied.

In `@apps/api/plane/authentication/views/app/email.py`:
- Around line 33-48: Extract the duplicated authentication throttle check and
RATE_LIMIT_EXCEEDED redirect into a shared authentication_rate_limit_redirect
helper, parameterized for app or space redirects and returning None when
allowed. In apps/api/plane/authentication/views/app/email.py lines 33-48 and
158-172, replace each block with the helper using is_app=True; in
apps/api/plane/authentication/views/space/email.py lines 32-47 and 133-147,
replace each with is_space=True.

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📥 Commits

Reviewing files that changed from the base of the PR and between a8e53b6 and 47ab37c.

📒 Files selected for processing (6)

• apps/api/plane/app/serializers/project.py
• apps/api/plane/authentication/rate_limit.py
• apps/api/plane/authentication/views/app/email.py
• apps/api/plane/authentication/views/space/email.py
• apps/api/plane/tests/unit/utils/test_paginator.py
• apps/api/plane/utils/paginator.py

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[mguptahub]

Thanks @coderabbitai — both valid, fixed in 3257ee9:

1. Email-only throttle key → victim lockout DoS (Major): AuthenticationAccountThrottle.get_cache_key now combines the normalized email and the client IP (email:<e>|ip:<ip>). An attacker on other IPs can no longer consume a victim's bucket, while single-source guessing against an account is still capped. (Fully defeating a spoofed-source distributed brute force additionally requires a trustworthy client IP — i.e. correct NUM_PROXIES/proxy config so X-Forwarded-For can't be forged — which is the deployment-side control noted on the tracking issue.)

2. Malformed AUTHENTICATION_ACCOUNT_RATE_LIMIT crash (Minor): added _valid_rate_or_default() — the env value is validated as a well-formed DRF rate and falls back to 5/minute if not, so a misconfig can't take auth down instance-wide.

Added regression tests for both (tests/unit/authentication/test_rate_limit.py, 15 cases).

[coderabbitai]

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For best results, initiate chat on the files or code changes.

@mguptahub Thanks for addressing both findings. Combining the normalized email with the client IP prevents cross-IP victim bucket exhaustion, and validating the configured DRF rate with a safe default removes the instance-wide misconfiguration failure mode. The regression coverage is appreciated.

🐇✅

---

✏️ Learnings added

Learnt from: mguptahub
URL: https://github.com/makeplane/plane/pull/9486

Timestamp: 2026-07-28T09:42:50.847Z
Learning: In `apps/api/plane/authentication/rate_limit.py`, `AuthenticationAccountThrottle` keys authentication attempts by normalized submitted email plus the client IP to prevent an attacker on a different IP from exhausting a victim account’s throttle bucket. Correct deployment configuration of trusted proxies and `NUM_PROXIES` remains required so client IP headers cannot be spoofed.

Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure review instructions. You can manage existing learnings in the app.

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Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

Suppressed comments (2)

apps/api/plane/utils/paginator.py:692

• The new cursor bound allows cursor.value == 0. In GroupedOffsetPaginator.get_result(), offset is computed as cursor.offset * cursor.value, so a 0 value makes every page (offset>0) map back to offset=0 and repeats the first page. Consider requiring cursor.value to be a positive integer (and normalizing/rejecting float values) before allowing it to drive grouped pagination.

        effective_max_per_page = max(max_per_page, default_per_page)
        if not (0 <= input_cursor.value <= effective_max_per_page) or input_cursor.offset < 0:
            raise ParseError(detail="Invalid cursor parameter.")

apps/api/plane/tests/unit/utils/test_paginator.py:143

• The cursor-bound regression test doesn't cover cursor values of 0. Since grouped pagination uses cursor.value in offset calculation, add a case like "0:1:0" (or "0:0:0") to ensure the guard rejects zero values and prevents repeated first-page results.

    @pytest.mark.parametrize("cursor", ["-1:0:0", "1000000:0:0", "20:-1:0"])

[mguptahub]

Follow-up commit (33977a3) closes three gaps in the same vulnerability classes this PR already fixes elsewhere, found on adjacent code the original diff didn't touch:

1. Negative per_page still crashed non-grouped pagination (plane/utils/paginator.py, get_per_page())
This PR clamps cursor.value/cursor.offset so the grouped paginator can't be driven into a negative slice bound. But get_per_page() only ever checked per_page against the upper bound (max_per_page); a negative per_page query param sailed through untouched, reached OffsetPaginator.get_result(), and produced the same unhandled Django "Negative indexing is not supported" (HTTP 500) via a different input. get_per_page() now rejects negative values with a ParseError, the same way it already rejects an over-large one. Also deduplicated the max(max_per_page, default_per_page) computation that existed both in get_per_page() and again in paginate().

2 & 3. IssueViewSerializer and CycleWriteSerializer had the same mass-assignment gap fixed on ProjectSerializer
This PR marks created_by/updated_by read-only on ProjectSerializer because BaseModel.save() never re-stamps created_by on update, so with fields = "__all__" and no read_only_fields entry a client can forge it via PATCH. IssueViewSerializer (plane/app/serializers/view.py) and CycleWriteSerializer (plane/app/serializers/cycle.py) had the identical gap and are fixed the same way.

Also corrected the ProjectSerializer comment, which claimed save() "only backfills created_by when it is None" — it actually stamps created_by unconditionally on create; the real gap is that update() never touches it at all.

Tests (plane/tests/unit/utils/test_paginator.py, new plane/tests/unit/serializers/test_mass_assignment.py): added TestGetPerPageNegativeRejected (negative/zero/boundary per_page cases) and mass-assignment regression tests for both serializers that attempt to forge created_by/updated_by via a partial update and assert the forged value is discarded. Full unit suite (338 tests) and the relevant project/cycle contract tests (53 tests) pass.

Separately, not touched: plane/utils/paginator.py and plane/tests/unit/utils/test_paginator.py already carry an advisory reference from an earlier, already-merged PR, unrelated to this diff — left as-is per scope; flagging for a follow-up if that still needs cleanup.

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Actionable comments posted: 1

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Inline comments:
In `@apps/api/plane/utils/paginator.py`:
- Around line 655-660: Update the per_page validation in the paginator helper to
reject zero as well as negative values before returning, preventing
OffsetPaginator.get_result() from receiving a zero limit; preserve the existing
maximum-value validation and ParseError behavior.

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📥 Commits

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📒 Files selected for processing (6)

• apps/api/plane/app/serializers/cycle.py
• apps/api/plane/app/serializers/project.py
• apps/api/plane/app/serializers/view.py
• apps/api/plane/tests/unit/serializers/test_mass_assignment.py
• apps/api/plane/tests/unit/utils/test_paginator.py
• apps/api/plane/utils/paginator.py

🚧 Files skipped from review as they are similar to previous changes (1)

• apps/api/plane/app/serializers/project.py

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[dheeru0198]

Review against current preview (6c16585)

A few changes suggested. The fixes are still needed; the project.py edits that landed in #10055/#10057 are in separate hunks.

1. major apps/api/plane/utils/paginator.py:704: cursor.value=1000 passes validation with per_page=1, so grouped pagination can return up to 1000 rows per group and the next cursor switches to 1, repeating rows. Suggest using per_page for grouped offsets and limits (or rejecting a mismatched cursor value) and testing with a real grouped queryset.
2. minor apps/api/plane/app/serializers/estimate.py:31: EstimatePointSerializer (used for PATCH) still has a writable created_by. Suggest making its audit fields read-only too.
3. minor apps/api/plane/tests/unit/serializers/test_mass_assignment.py:34: New tests cover cycles and views, but none would fail if the ProjectSerializer change were removed. Suggest adding a project PATCH regression test.
4. nit apps/api/plane/utils/paginator.py:697: Suggest rewording the new comments and test docstrings to state the validation rule rather than describing the prior gap.

Notes from an automated review (Claude Code + Codex), checked against current preview.

[dheeru0198]

Approving: review points addressed and re-verified; CI green.