CVE-2017-14251

TYPO3 Arbitrary Code Execution

8.8 HighFix available

Unrestricted File Upload vulnerability in the fileDenyPattern in sysext/core/Classes/Core/SystemEnvironmentBuilder.php in TYPO3 7.6.0 to 7.6.21 and 8.0.0 to 8.7.4 allows remote authenticated users to upload files with a .pht extension and consequently execute arbitrary PHP code.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.31%Up 1.0 points since Apr 14, 2021

What each source reports

NVD Score used 8.8

Record: CVE-2017-14251
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness: CWE-434
Updated: 2026-11-02

CVE List No score

Record: CVE-2017-14251
Updated: 2026-11-02

EUVDEUVD-2022-3781 No score

Record: EUVD-2022-3781
Updated: 2026-11-03

GitHub AdvisoriesGHSA-fh4q-hxrw-cjqq 8.8

TYPO3 Arbitrary Code Execution

Record: GHSA-fh4q-hxrw-cjqq
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

OSV 8.8

Record: CVE-2017-14251
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-fh4q-hxrw-cjqq 8.8

TYPO3 Arbitrary Code Execution

Record: GHSA-fh4q-hxrw-cjqq
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

Affected products

typo3

Affected packages

Affected packages
Package	Affected	Fixed
`typo3/cms` Packagist	7.6.0 up to 7.6.22	7.6.22
`typo3/cms` Packagist	8.0.0 up to 8.7.5	8.7.5
`typo3/cms` Packagist	7.6.0 up to 7.6.22, plus listed versions 7.6.17.6.107.6.117.6.127.6.13 Show 16 moreShow less 7.6.147.6.157.6.167.6.177.6.187.6.197.6.27.6.37.6.47.6.57.6.67.6.77.6.87.6.9v7.6.20v7.6.21	7.6.22
`typo3/cms` Packagist	8.0.0 up to 8.7.5, plus listed versions 8.0.18.1.08.1.18.1.28.2.0 Show 14 moreShow less 8.2.18.3.08.3.18.4.08.4.18.5.08.5.18.6.08.6.18.7.08.7.18.7.2v8.7.3v8.7.4	8.7.5

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-14251 is a high vulnerability (CVSS 8.8) in Typo3, published September 11, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.31%, the 83rd percentile. Fixed in typo3/cms 7.6.22.