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HIGH severity

The TYPO3 CMS Backend has Broken Authentication in Backend MFAGHSA-744g-7qm9-hjh9

HIGHFix: TYPO3-CMS/backend@034f589

GHSA-744g-7qm9-hjh9 is a high-severity (CVSS 7.2) CWE-288 vulnerability in typo3/cms-backend. A fix is available for typo3/cms-backend — see the affected versions and patch details below.

Also known asCVE-2025-47941
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-744g-7qm9-hjh9.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs41th percentile — riskier than 41% of all scored CVEsHighest risk
0.00%0.32%0.65%0.97%0.3%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐘typo3/cms-backend🐘typo3/cms-backend

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Problem

The multifactor authentication (MFA) dialog presented during backend login can be bypassed due to insufficient enforcement of access restrictions on all backend routes.

Successful exploitation requires valid backend user credentials, as MFA can only be bypassed after successful authentication.

Solution

Update to TYPO3 versions 12.4.31 LTS, 13.4.12 LTS that fix the problem described.

Credits

Thanks to Jens Jacobsen and Y. Kahveci for reporting this issue, and to TYPO3 security team member Torben Hansen for fixing it.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisttypo3/cms-backend≥ 12.0.0&&< 12.4.3112.4.31composer require typo3/cms-backend:^12.4.31
🐘Packagisttypo3/cms-backend≥ 13.0.0&&< 13.4.1213.4.12composer require typo3/cms-backend:^13.4.12

Affected Products

1 product · 2 configurations
Application
typo3typo3
≥ 13.0.0 && < 13.4.12
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms-backend, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update typo3/cms-backend to 12.4.31 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-744g-7qm9-hjh9 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Problem The multifactor authentication (MFA) dialog presented during backend login can be bypassed due to insufficient enforcement of access restrictions on all backend routes. Successful exploitation requires valid backend user credentials, as MFA can only be bypassed after successful authentication. ### Solution Update to TYPO3 versions 12.4.31 LTS, 13.4.12 LTS that fix the problem described. ### Credits Thanks to Jens Jacobsen and Y. Kahveci for reporting this issue, and to TYPO3 security team member Torben Hansen for fixing it.
O3 Security · Impact-Aware SCA

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The TYPO3 CMS Backend has Broken Authentication in…