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Findings

CVE-2020-13671

Drupal core Un-restricted Upload of File

Published Nov 20, 2020 · updated Jun 16, 2026 · drupal drupal

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.

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.

Required action

Apply updates per vendor instructions.

CISA due date Jul 18, 2022

Affected

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

Sources

  • CISA KEVCVE-2020-13671

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

    cisa.gov
  • CVE.orgCVE-2020-13671

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2020-13671

    30-day exploitation probability 35.4%

    first.org
  • NIST NVDCVE-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

References

CVE-2020-13671 · ZeroDay Findings