## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.
YES
## What kind of change does this PR introduce?
Bug fix (security hardening).
## What is the current behavior?
[PRODSEC-120](https://linear.app/supabase/issue/PRODSEC-120/mythos-ant-2026-btrnt5a3-server-action-accepts-client-controlled-crm)
— the marketing form server action accepts the full \`crm\` config
(Notion \`database_id\`, HubSpot \`formGuid\`, Customer.io \`event\`,
\`staticProperties\`, etc.) from the client, so a crafted submission can
write to any Notion database the integration token reaches, post to any
HubSpot form in the portal, or trigger arbitrary Customer.io events.
## What is the new behavior?
The client now posts only \`{ slug, formId }\` plus the field values;
\`submitFormAction\` validates the ref with Zod, looks the trusted CRM
config up from the in-process \`_go/**\` page registry via a resolver
wired up in \`instrumentation.ts\`, and fails closed if the form isn't
found. \`SectionRenderer\` also strips \`crm\` from the section before
it crosses into the client bundle (so \`database_id\` / \`formGuid\` no
longer ship in page HTML), \`getAllGoPages\` rejects any form section
with \`crm\` but no stable \`id\`, and per-submission size/character
limits were tightened.
## Additional context
Separate follow-ups (not in this PR): confirm \`NOTION_FORMS_API_KEY\`
is write-only and scoped to the forms subtree, and chase down the
\`NOTION_EVENTS_API_KEY\` validity issue raised on the Linear ticket.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
- Forms now support unique identifiers for enhanced tracking and
management
- Server-side form configuration management for improved reliability
* **Improvements**
- Enhanced form validation during page initialization to catch
configuration issues
- Improved form submission handling with better error detection and
reporting
- Strengthened form operations with fail-safe configuration resolution
<!-- review_stack_entry_start -->
[](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/46239?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)
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<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.
YES/NO
## What kind of change does this PR introduce?
Bug fix, feature, docs update, ...
## What is the current behavior?
Please link any relevant issues here.
## What is the new behavior?
Feel free to include screenshots if it includes visual changes.
## Additional context
Add any other context or screenshots.
Alan Daniel
