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Vulnerabilities

Vulnerability · CVE-2020-13671

Drupal core Un-restricted Upload of File

Published Nov 20, 2020 · catalog updated Jun 16, 2026 · Drupal Drupal Core

Patch now

CVE-2020-13671 is in the CISA known-exploited catalog, due Jul 18, 2022. Confirm Drupal Drupal Core against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High8.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
35.35%
Remediation
Remediation guidance
Affected products
cpe drupal/drupal · cpe fedoraproject/fedora · vendor Drupal Drupal Core · vendor Drupal Drupal core

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe drupal/drupalversion unspecified
  • cpe fedoraproject/fedora32
  • cpe fedoraproject/fedora33
  • vendor Drupal Drupal Coreversion unspecified
  • vendor Drupal Drupal coreversion unspecified

How to fix CVE-2020-13671

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-13671 is in the CISA known-exploited catalog, due Jul 18, 2022. Confirm Drupal Drupal Core against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 32, 33. Apply updates per vendor instructions.

What should an analyst verify?

CWE-434: Unrestricted Upload of File with Dangerous Type. EPSS 35.35%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Drupal security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 20, 2020 · Catalog

    Detected

    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.

  2. Jan 18, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Jul 18, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2020-13671

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

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-13671

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-13671

    30-day exploitation probability 35.4%

    first.org
  • NIST NVDVulnerability recordCVE-2020-13671

    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 ver

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2020-13671

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.