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High, CVSS 7.3

TYPO3 Security Misconfiguration for Backend User Accounts

GHSA-c5mj-39cf-3pp5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (typo3/cms 9.5.4, 8.7.23), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist typo3/cms

    Affected
    >= 8.0.0, < 8.7.23>= 9.0.0, < 9.5.4
    Fixed in
    8.7.23, 9.5.4

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

When using the TYPO3 backend in order to create new backend user accounts, database records containing insecure or empty credentials might be persisted. When the type of user account is changed - which might be entity type or the admin flag for backend users - the backend form is reloaded in order to reflect changed configuration possibilities. However, this leads to persisting the current state as well, which can result into some of the following: - account contains empty login credentials (username and/or password) - account is incomplete and contains weak credentials (username and/or password) Albeit the functionality provided by the TYPO3 core cannot be used either with empty usernames or empty passwords, it still can be a severe vulnerability to custom authentication service implementations. This weakness cannot be directly exploited and requires interaction on purpose by some backend user having according privileges.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-c5mj-39cf-3pp5

Agent brief

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# Patch Next advisory brief: GHSA-c5mj-39cf-3pp5

Advisory: TYPO3 Security Misconfiguration for Backend User Accounts
IDs: GHSA-c5mj-39cf-3pp5
Record: https://patchnext.com/advisories/ghsa-c5mj-39cf-3pp5 (revision 1, source checked 26 Oct 2026, 14:25 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: typo3/cms 9.5.4, 8.7.23. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist typo3/cms: affected >= 8.0.0, < 8.7.23; >= 9.0.0, < 9.5.4; fixed in 8.7.23, 9.5.4

## Suggested inspection (read-only)
- Packagist typo3/cms: check the installed version with your package manager.

## 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 typo3/cms.
- 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://github.com/advisories/GHSA-c5mj-39cf-3pp5 (GitHub-reviewed advisory GHSA-c5mj-39cf-3pp5 lists affected ranges: Packagist typo3/cms >=8.0.0 =9.0.0 <9.5.4)

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