UpHeron
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Servers and applications

CVE-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 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.

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 18 Jan 2022.

Severity
High 8.8
Published
20 Nov 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
7.74, 8.8.11, 8.9.9, 9.0.8
Sources
NVD

Affected software

SoftwareAffected versions
DrupalServers and applications · cpe:a:drupal:drupal
  • From 7.0 before 7.74
  • From 8.8.0 before 8.8.11
  • From 8.9.0 before 8.9.9
  • From 9.0.0 before 9.0.8

Known exploited

CISA name
Drupal core Un-restricted Upload of File
Required action
Apply updates per vendor instructions.
Due for US agencies
18 Jul 2022
Used in ransomware
Not known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2020-13671
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2020-13671