CVE-2020-13671
Drupal core Unrestricted Upload of File with Dangerous Type
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2020-13671- 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 - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-434
- Updated
- 2026-11-02
CVE List
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.
- Record
CVE-2020-13671- 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 - Weakness
- CWE-434
- Updated
- 2026-11-02
EUVDEUVD-2021-2168
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.
- Record
EUVD-2021-2168- 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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-68jc-v27h-vhmw
Drupal core Unrestricted Upload of File with Dangerous Type
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.
- Record
GHSA-68jc-v27h-vhmw- 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/E:H - Weakness
- CWE-434
- Updated
- 2026-11-02
CISA KEV No score
Drupal core Un-restricted Upload of File
Improper sanitization in the extension file names is present in Drupal core.
- Record
CVE-2020-13671- Weakness
- CWE-434
- Updated
- 2026-11-02
OSVALPINE-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.
- Record
ALPINE-CVE-2020-13671- 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 - Updated
- 2026-11-03
Show 7 moreShow less
OSV
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.
- Record
CVE-2020-13671- 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 - Updated
- 2026-11-02
OSVGHSA-68jc-v27h-vhmw
Drupal core Unrestricted Upload of File with Dangerous Type
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.
- Record
GHSA-68jc-v27h-vhmw- 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/E:H - Weakness
- CWE-434
- Updated
- 2026-11-02
OSVUBUNTU-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.
- Record
UBUNTU-CVE-2020-13671- 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 - Updated
- 2026-11-02
OSVBIT-drupal-2020-13671 No score
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.
- Record
BIT-drupal-2020-13671- Updated
- 2026-11-02
OSVDRUPAL-CORE-2020-012 No score
Update November 18: Documented longer list of dangerous file extensions
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.
- Record
DRUPAL-CORE-2020-012- Updated
- 2026-11-02
OSVUSN-6981-1 No score
drupal7 vulnerabilities
It was discovered that Drupal incorrectly sanitized uploaded filenames. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2020-13671)
It was discovered that Drupal incorrectly sanitized archived filenames. A remote attacker could possibly use this issue to overwrite arbitrary files, or execute arbitrary code. (CVE-2020-28948, CVE-2020-28949)
- Record
USN-6981-1- Updated
- 2026-11-02
OSVUSN-6981-2 No score
drupal7 vulnerabilities
USN-6981-1 fixed vulnerabilities in Drupal. This update provides the corresponding updates for Ubuntu 14.04 LTS.
Original advisory details:
It was discovered that Drupal incorrectly sanitized uploaded filenames. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2020-13671)
It was discovered that Drupal incorrectly sanitized archived filenames. A remote attacker could possibly use this issue to overwrite arbitrary files, or execute arbitrary code. (CVE-2020-28948, CVE-2020-28949)
- Record
USN-6981-2- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
drupal/corePackagist |
9.0.0 up to 9.0.8 | 9.0.8 |
drupal/corePackagist |
8.9.0 up to 8.9.9 | 8.9.9 |
drupal/corePackagist |
8.0.0 up to 8.8.11 | 8.8.11 |
drupal/corePackagist |
7.0.0 up to 7.74 | 7.74 |
drupal/drupalPackagist |
7.0.0 up to 7.74 | 7.74 |
drupal/drupalPackagist |
8.0.0 up to 8.8.11 | 8.8.11 |
drupal/drupalPackagist |
8.9.0 up to 8.9.9 | 8.9.9 |
drupal/drupalPackagist |
9.0.0 up to 9.0.8 | 9.0.8 |
drupal7Alpine:v3.11 |
before 7.74-r0 | 7.74-r0 |
drupal7Alpine:v3.12 |
before 7.74-r0 | 7.74-r0 |
Show 21 moreShow less
| Package | Affected | Fixed |
|---|---|---|
drupal7Alpine:v3.13 |
before 7.74-r0 | 7.74-r0 |
drupal7Alpine:v3.14 |
before 7.74-r0 | 7.74-r0 |
drupal7Alpine:v3.15 |
before 7.74-r0 | 7.74-r0 |
drupal7Alpine:v3.16 |
before 7.74-r0 | 7.74-r0 |
drupal7Alpine:v3.17 |
before 7.74-r0 | 7.74-r0 |
drupal7Alpine:v3.18 |
before 7.74-r0 | 7.74-r0 |
drupal7Alpine:v3.19 |
before 7.74-r0 | 7.74-r0 |
drupal7Alpine:v3.20 |
before 7.74-r0 | 7.74-r0 |
drupalBitnami |
7.0.0 up to 7.74.0, 8.8.0 up to 8.8.11, 8.9.0 up to 8.9.9, 9.0.0 up to 9.0.8 | 7.74.08.8.118.9.99.0.8 |
drupal7Debian:9 From an advisory covering 2 CVEs |
before 7.52-2+deb9u12, plus listed versions 7.52-27.52-2+deb9u17.52-2+deb9u107.52-2+deb9u117.52-2+deb9u2 Show 7 moreShow less7.52-2+deb9u37.52-2+deb9u47.52-2+deb9u57.52-2+deb9u67.52-2+deb9u77.52-2+deb9u87.52-2+deb9u9 |
7.52-2+deb9u12 |
drupal/corePackagist |
8.0.0 up to 8.8.11, 8.9.0 up to 8.9.9, 9.0.0 up to 9.0.8, plus listed versions 8.0.18.0.28.0.38.0.48.0.5 Show 45 moreShow less8.0.68.1.08.1.0-beta18.1.0-beta28.1.0-rc18.1.18.1.108.1.28.1.38.1.48.1.58.1.68.1.78.1.88.1.98.2.08.2.0-beta18.2.0-beta28.2.0-beta38.2.0-rc18.2.0-rc28.2.18.2.28.2.38.2.48.2.58.2.68.2.78.2.88.3.08.3.0-alpha18.3.0-beta18.3.0-rc18.3.0-rc28.3.18.3.28.3.38.3.48.3.58.3.68.3.78.3.88.3.98.4.08.4.0-alpha1 |
8.8.118.9.99.0.8 |
drupal/corePackagist |
9.0.0 up to 9.0.8, plus listed versions 9.0.19.0.29.0.39.0.49.0.59.0.69.0.7 |
9.0.8 |
drupal/corePackagist |
8.9.0 up to 8.9.9, plus listed versions 8.9.18.9.28.9.38.9.48.9.58.9.68.9.78.9.8 |
8.9.9 |
drupal/corePackagist |
8.0.0 up to 8.8.11, plus listed versions 8.0.18.0.28.0.38.0.48.0.5 Show 45 moreShow less8.0.68.1.08.1.0-beta18.1.0-beta28.1.0-rc18.1.18.1.108.1.28.1.38.1.48.1.58.1.68.1.78.1.88.1.98.2.08.2.0-beta18.2.0-beta28.2.0-beta38.2.0-rc18.2.0-rc28.2.18.2.28.2.38.2.48.2.58.2.68.2.78.2.88.3.08.3.0-alpha18.3.0-beta18.3.0-rc18.3.0-rc28.3.18.3.28.3.38.3.48.3.58.3.68.3.78.3.88.3.98.4.08.4.0-alpha1 |
8.8.11 |
drupal/drupalPackagist |
8.0.0 up to 8.8.11, plus listed versions 8.0.18.0.28.0.38.0.48.0.5 Show 45 moreShow less8.0.68.1.08.1.0-beta18.1.0-beta28.1.0-rc18.1.18.1.108.1.28.1.38.1.48.1.58.1.68.1.78.1.88.1.98.2.08.2.0-beta18.2.0-beta28.2.0-beta38.2.0-rc18.2.0-rc28.2.18.2.28.2.38.2.48.2.58.2.68.2.78.2.88.3.08.3.0-alpha18.3.0-beta18.3.0-rc18.3.0-rc28.3.18.3.28.3.38.3.48.3.58.3.68.3.78.3.88.3.98.4.08.4.0-alpha1 |
8.8.11 |
drupal/drupalPackagist |
8.9.0 up to 8.9.9, plus listed versions 8.9.18.9.28.9.38.9.48.9.58.9.68.9.78.9.8 |
8.9.9 |
drupal/drupalPackagist |
9.0.0 up to 9.0.8, plus listed versions 9.0.19.0.29.0.39.0.49.0.59.0.69.0.7 |
9.0.8 |
drupal7Ubuntu:Pro:14.04:LTS |
before 7.26-1ubuntu0.1+esm2, plus listed versions 7.23-17.24-17.24-27.26-17.26-1ubuntu0.17.26-1ubuntu0.1+esm1 |
7.26-1ubuntu0.1+esm2 |
drupal7Ubuntu:Pro:16.04:LTS |
before 7.44-1ubuntu1~16.04.0+esm2, plus listed versions 7.38-17.41-17.44-1ubuntu1~16.04.07.44-1ubuntu1~16.04.0+esm1 |
7.44-1ubuntu1~16.04.0+esm2 |
drupal7Ubuntu:Pro:16.04:LTS From an advisory covering 3 CVEs |
before 7.44-1ubuntu1~16.04.0+esm2, plus listed versions 7.38-17.41-17.44-1ubuntu1~16.04.07.44-1ubuntu1~16.04.0+esm1 |
7.44-1ubuntu1~16.04.0+esm2 |
drupal7Ubuntu:Pro:14.04:LTS From an advisory covering 3 CVEs |
before 7.26-1ubuntu0.1+esm2, plus listed versions 7.23-17.24-17.24-27.26-17.26-1ubuntu0.17.26-1ubuntu0.1+esm1 |
7.26-1ubuntu0.1+esm2 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | Dungsocool/CVE-2020-13671 | 2026-08-22 |
| PoC in GitHub | Dungsocool/CVE-2020-13671-old | 2026-08-22 |
| PoC in GitHub | ivanesk315/CVE-2020-13671 | 2026-09-10 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| exploitation | ||
| affected, aliases, references | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-13671 is a high vulnerability (CVSS 8.8) in Drupal, published November 18, 2020. CISA lists it as known to be exploited, since January 18, 2022. EUVD reports exploitation since January 18, 2022. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 36.2%, the 98th percentile. Fixed in drupal/core 9.0.8.
References
drupal.org/sa-core-2020-012
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13671
nvd.nist.gov/vuln/detail/CVE-2020-13671
github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2020-13671.yaml
Show 14 moreShow less
security.alpinelinux.org/vuln/CVE-2020-13671
ubuntu.com/security/CVE-2020-13671
cve.org/CVERecord?id=CVE-2020-13671
Left out here: 276 versions. The JSON record has them.