# DRUPAL-CONTRIB-2021-023: This module provides a user interface that allows the implementation and use of *Form modes* without custom development.

> Attackers with specific form mode permissions can bypass access restrictions to modify entity forms, requiring a module update.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Jul 2021

## What is DRUPAL-CONTRIB-2021-023?

DRUPAL-CONTRIB-2021-023 is a missing authorization vulnerability in drupal/form_mode_manager, published on 21 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

This module provides a user interface that allows the implementation and use of *Form modes* without custom development.

The module does not sufficiently respect access restrictions to entity forms for routes it creates to use specific form modes.

This vulnerability is mitigated by the fact that an attacker must have a role with the permission to use a specific form mode, for example `use X form mode`.

## Which versions are affected by DRUPAL-CONTRIB-2021-023?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `drupal/form_mode_manager` | Packagist:https://packages.drupal.org/8 | All versions | 1.4.0 |

## How do I fix DRUPAL-CONTRIB-2021-023?

Upgrade to a fixed version.

## Is DRUPAL-CONTRIB-2021-023 being exploited?

There is no known exploitation of DRUPAL-CONTRIB-2021-023 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for DRUPAL-CONTRIB-2021-023 and fix it if it is affected.

What it is: DRUPAL-CONTRIB-2021-023 is a missing authorization vulnerability in drupal/form_mode_manager, published on 21 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of DRUPAL-CONTRIB-2021-023 in the wild and no public exploit code.

Affected product: drupal/form_mode_manager. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/DRUPAL-CONTRIB-2021-023/ (Markdown: https://insights.sbomify.com/DRUPAL-CONTRIB-2021-023/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/DRUPAL-CONTRIB-2021-023

---
From sbomify Insights: https://insights.sbomify.com/DRUPAL-CONTRIB-2021-023/
Summaries are generated and may contain mistakes; the official description above is the record.