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MEDIUM severity

CVE-2010-3661 — cms-backend

MEDIUM

CVE-2010-3661 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in typo3/cms-backend. A fix is available for typo3/cms-backend — see the affected versions and patch details below.

TYPO3 Open Redirection vulnerability on the backend

Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs60th percentile — riskier than 60% of all scored CVEsHighest risk
0.00%0.47%0.94%1.40%0.3%0.9%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

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

TYPO3 before 4.1.14, 4.2.x before 4.2.13, 4.3.x before 4.3.4 and 4.4.x before 4.4.1 allows Open Redirection on the backend.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisttypo3/cms-backendall versions4.1.14composer require typo3/cms-backend:^4.1.14
🐘Packagisttypo3/cms-backend≥ 4.2.0&&< 4.2.134.2.13composer require typo3/cms-backend:^4.2.13
🐘Packagisttypo3/cms-backend≥ 4.3.0&&< 4.3.44.3.4composer require typo3/cms-backend:^4.3.4
🐘Packagisttypo3/cms-backend≥ 4.4.0&&< 4.4.14.4.1composer require typo3/cms-backend:^4.4.1

Affected Products

1 product · 4 configurations
Application
typo3typo3
≥ 4.4.0 && < 4.4.1
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 4.1.14 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2010-3661 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

TYPO3 before 4.1.14, 4.2.x before 4.2.13, 4.3.x before 4.3.4 and 4.4.x before 4.4.1 allows Open Redirection on the backend.
O3 Security · Impact-Aware SCA

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CVE-2010-3661: cms-backend — Fixed in 4.1.14