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CRITICAL severity

CVE-2011-4628 — cms

CRITICAL

CVE-2011-4628 is a critical-severity (CVSS 9.8) Improper Authentication vulnerability in typo3/cms. A fix is available for typo3/cms — see the affected versions and patch details below.

Typo3 Authentication Bypass

Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs76th percentile — riskier than 76% of all scored CVEsHighest risk
0.21%0.85%1.50%2.15%0.7%1.6%May 26Aug 26Oct 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

3 pkgs affected
🐘typo3/cms🐘typo3/cms🐘typo3/cms

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

TYPO3 before 4.3.12, 4.4.x before 4.4.9, and 4.5.x before 4.5.4 allows remote attackers to bypass authentication mechanisms in the backend through a crafted request.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisttypo3/cmsall versions4.3.12composer require typo3/cms:^4.3.12
🐘Packagisttypo3/cms≥ 4.4.0&&< 4.4.94.4.9composer require typo3/cms:^4.4.9
🐘Packagisttypo3/cms≥ 4.5.0&&< 4.5.44.5.4composer require typo3/cms:^4.5.4

Affected Products

1 product · 3 configurations
Application
typo3typo3
≥ 4.5.0 && < 4.5.4
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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update typo3/cms to 4.3.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2011-4628 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

TYPO3 before 4.3.12, 4.4.x before 4.4.9, and 4.5.x before 4.5.4 allows remote attackers to bypass authentication mechanisms in the backend through a crafted request.
O3 Security · Impact-Aware SCA

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CVE-2011-4628: cms — Fixed in 4.3.12