CVE-2020-13671: Drupal core Un-restricted Upload of File

Reference page built from the source records below, each shown as its source publishes it. Dataset version ref-0ab211e47027, updated 2026-11-02T23:39:54.475Z.

CISA Known Exploited Vulnerabilities

Name: Drupal core Un-restricted Upload of File
Vendor: Drupal
Product: Drupal core
Added to the catalog: 2022-01-18
Due date for US federal agencies: 2022-07-18
Weaknesses: CWE-434
Catalog version: 2026.10.30

Improper sanitization in the extension file names is present in Drupal core.

Required action (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

https://nvd.nist.gov/vuln/detail/CVE-2020-13671

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status: Analyzed
Published: 2020-11-20T16:15:15.433
Last modified: 2026-06-17T02:53:32.867
Weaknesses: CWE-434

Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.

Metric	Score	Severity	Vector	Scored by
CVSS 3.1	8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	[email protected] (Primary)
CVSS 3.1	8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
CVSS 2.0	6.5	MEDIUM	AV:N/AC:L/Au:S/C:P/I:P/A:P	[email protected] (Primary)

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/ (Mailing List, Release Notes)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT/ (Mailing List, Release Notes)
https://www.drupal.org/sa-core-2020-012 (Vendor Advisory)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/ (Mailing List, Release Notes)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT/ (Mailing List, Release Notes)
https://www.drupal.org/sa-core-2020-012 (Vendor Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13671 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:51.476Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2020-13671

CVE record

Assigner: drupal
State: PUBLISHED
Published: 2020-11-20T15:40:39.000Z
Updated: 2025-10-21T23:35:32.528Z
Problem types: Remote code execution

References

Read on 2026-11-03T01:03:24.825Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2020/13xxx/CVE-2020-13671.json

Also known as / affected packages

GHSA-68jc-v27h-vhmw

Also known as: CVE-2020-13671. OSV.dev record, GitHub advisory.

Packagist drupal/core: introduced 9.0.0, fixed 9.0.8
Packagist drupal/core: introduced 8.9.0, fixed 8.9.9
Packagist drupal/core: introduced 8.0.0, fixed 8.8.11
Packagist drupal/core: introduced 7.0.0, fixed 7.74
Packagist drupal/drupal: introduced 7.0.0, fixed 7.74
Packagist drupal/drupal: introduced 8.0.0, fixed 8.8.11
Packagist drupal/drupal: introduced 8.9.0, fixed 8.9.9
Packagist drupal/drupal: introduced 9.0.0, fixed 9.0.8

Read on 2026-11-03T00:50:16.524Z under licence ghsa-cc-by-4.0@9e5f1b3c from https://api.osv.dev/v1/vulns/GHSA-68jc-v27h-vhmw

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

CWE-434: Unrestricted Upload of File with Dangerous Type

Harden: Software Update (acts on Software)
Restore: Restore Software (acts on Software)
Harden: Credential Scrubbing (acts on Subroutine)
Harden: Variable Initialization (acts on Subroutine)
Harden: Trusted Library (acts on Subroutine)
Harden: Domain Logic Validation (acts on Subroutine)
Isolate: Application-based Process Isolation (acts on Subroutine)
Model: Software Inventory (acts on Software)
Model: Asset Vulnerability Enumeration (acts on Software)

D3FEND ontology version 1.6.0.

Read on 2026-11-02T23:56:37.096Z under licence d3fend-terms-of-use@f98cbc7e from https://d3fend.mitre.org/api/weakness/cwe/CWE-434.json

MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
"The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free license to use D3FEND for research, development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." Terms: https://d3fend.mitre.org/tou/

Sources and licences

CISA
Source: CISA Catalog of Known Exploited Vulnerabilities, version 2026.10.30, CC0 1.0. Use of this data does not imply endorsement by CISA or DHS.
CC0 1.0 Universal
National Vulnerability Database (NIST)
This product uses the NVD API but is not endorsed or certified by the NVD.
NVD API Terms of Use (NIST publications in the public domain, 17 U.S.C. 105)
CVE Program, The MITRE Corporation
Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation. CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
CVE Program Terms of Use ("CVE Usage" licence)
GitHub Advisory Database via OSV.dev
GHSA-68jc-v27h-vhmw: GitHub Advisory Database, https://github.com/advisories/GHSA-68jc-v27h-vhmw. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), provided as is, without warranties. Retrieved via OSV.dev (https://osv.dev/vulnerability/GHSA-68jc-v27h-vhmw), which enriches records; fields selected and reformatted by ransomware-tracker.com.
CC BY 4.0
MITRE D3FEND
MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
"The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free license to use D3FEND for research, development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." Terms: https://d3fend.mitre.org/tou/
MITRE D3FEND Terms of Use (site + knowledge graph); source repo MIT

Cite this page

Dragons Eye Ransomware Tracker, "CVE-2020-13671: Drupal core Un-restricted Upload of File",
entity page, dataset version ref-0ab211e47027, updated 2026-11-02T23:39:54.475Z,
https://ransomware-tracker.com/cve/CVE-2020-13671 (accessed 2026-11-03).
Underlying source: CISA Catalog of Known Exploited Vulnerabilities, version 2026.10.30.
Underlying source: National Vulnerability Database (NIST), CVE API 2.0, record last modified 2026-06-17T02:53:32.867.
Underlying source: CVE List (CVE Program, The MITRE Corporation), record updated 2025-10-21T23:35:32.528Z.
Underlying source: GitHub Advisory Database, GHSA-68jc-v27h-vhmw, via OSV.dev, modified 2025-12-10T23:41:21.622533Z.
Underlying source: MITRE D3FEND, ontology version 1.6.0.

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