Drupal core Unrestricted Upload of File with Dangerous Type

Exploitation

Confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H

EPSS

• CVE-2020-13671: 36.17% estimated exploitation activity in the next 30 days; percentile 98.48 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.

Published by the source

12 Oct 2021, 16:28 UTC

Last modified by the source

22 Oct 2025, 17:59 UTC

Source last checked

26 Oct 2026, 14:34 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-68jc-v27h-vhmw

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# Patch Next advisory brief: CVE-2020-13671

Advisory: Drupal core Unrestricted Upload of File with Dangerous Type
IDs: CVE-2020-13671, GHSA-68jc-v27h-vhmw
Record: https://patchnext.com/advisories/cve-2020-13671 (revision 1, source checked 26 Oct 2026, 14:34 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.
Vendor response: Vendor fix available; fixed versions by package: drupal/core 9.0.8, 8.9.9, 8.8.11, 7.74; drupal/drupal 9.0.8, 8.9.9, 8.8.11, 7.74. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist drupal/core: affected >= 9.0.0, < 9.0.8; >= 8.9.0, < 8.9.9; >= 8.0.0, < 8.8.11; >= 7.0.0, < 7.74; fixed in 7.74, 8.8.11, 8.9.9, 9.0.8
- Packagist drupal/drupal: affected >= 7.0.0, < 7.74; >= 8.0.0, < 8.8.11; >= 8.9.0, < 8.9.9; >= 9.0.0, < 9.0.8; fixed in 7.74, 8.8.11, 8.9.9, 9.0.8

## Suggested inspection (read-only)
- Packagist drupal/core: check the installed version with your package manager.
- Packagist drupal/drupal: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on drupal/core, drupal/drupal.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-68jc-v27h-vhmw (GitHub-reviewed advisory GHSA-68jc-v27h-vhmw lists affected ranges: Packagist drupal/core >=9.0.0 =8.9.0 =8.0.0 =7.0.0 =7.0.0 =8.0.0 =8.9.0 =9.0.0 <9.0.8)
- Verified: https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CISA added CVE-2020-13671 to the Known Exploited Vulnerabilities catalog on 2022-01-18.)

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