Unauthorized Access to Private Fields in User Registration API

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.6 · CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

EPSS

• CVE-2023-39345: 0.59% estimated exploitation activity in the next 30 days; percentile 48.16 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

System Details | Name | Value | |----------|------------------------| | OS | Windows 11 | | Version | 4.11.1 (node v16.14.2) | | Database | mysql | Description I marked some fields as private fields in user content-type, and tried to register as a new user via api, at the same time I added content to fill the private fields and sent a post request, and as you can see from the images below, I can write to the private fields. To prevent this, I went to the extension area and tried to extend the register method, for this I wanted to do it using the sanitizeInput function that I know in the source codes of the strap. But the sanitizeInput function did not filter out private fields. here's the solution I've temporarily kept to myself, code snippet

Published by the source

3 Nov 2023, 19:01 UTC

Last modified by the source

8 Nov 2023, 04:13 UTC

Source last checked

26 Oct 2026, 12:27 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-gc7p-j5xm-xxh2

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-gc7p-j5xm-xxh2

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# Patch Next advisory brief: CVE-2023-39345

Advisory: Unauthorized Access to Private Fields in User Registration API
IDs: CVE-2023-39345, GHSA-gc7p-j5xm-xxh2
Record: https://patchnext.com/advisories/cve-2023-39345 (revision 2, source checked 26 Oct 2026, 12:27 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @strapi/plugin-users-permissions 4.13.1; @strapi/strapi 4.13.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @strapi/plugin-users-permissions: affected >= 4.0.0, < 4.13.1; fixed in 4.13.1
- npm @strapi/strapi: affected >= 4.0.0, < 4.13.1; fixed in 4.13.1

## Suggested inspection (read-only)
- `npm ls @strapi/plugin-users-permissions --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @strapi/strapi --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @strapi/plugin-users-permissions, @strapi/strapi.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-gc7p-j5xm-xxh2 (OSV record GHSA-gc7p-j5xm-xxh2 lists affected ranges: npm @strapi/plugin-users-permissions >=4.0.0 =4.0.0 <4.13.1 (fixed))
- Verified: https://github.com/advisories/GHSA-gc7p-j5xm-xxh2 (GitHub-reviewed advisory GHSA-gc7p-j5xm-xxh2 lists affected ranges: npm @strapi/plugin-users-permissions >=4.0.0 =4.0.0 <4.13.1)

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