Skip to content
Fencer Vulns
critical 9.8

CVE-2020-13675 json

Unrestricted Upload of File with Dangerous Type in Drupal core

published 2021-09-15 5 y ago modified 2026-09-19 51 d ago also BIT-drupal-2020-13675 , DRUPAL-CONTRIB-2021-029 , DRUPAL-CORE-2021-008 , EUVD-2022-1196 , GHSA-v8wr-r69p-mmwx

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

Drupal's JSON:API and REST/File modules allow file uploads through their HTTP APIs. The modules do not correctly run all file validation, which causes an access bypass vulnerability. An attacker might be able to upload files that bypass the file validation process implemented by modules on the site.

Patch / fix

  • packagist drupal/core 8.9.19, 9.1.13, 9.2.6
  • bitnami drupal 8.9.19, 9.1.13, 9.2.6
  • packagist drupal/graphql 4.2.0
  • Drupal Core 8.9.19, 9.1.13, 9.2.6
  • drupal Arch Linux 9.2.6-1

arch linux advisories AVG-2407

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-13675 updated

drupal: multiple vulnerabiltiies

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist drupal/core
>=8.0.0, <8.9.19
>=9.1.0, <9.1.13
>=9.2.0, <9.2.6
8.9.19
9.1.13
9.2.6
bitnami drupal
>=8.0.0, <8.9.19
>=9.1.0, <9.1.13
>=9.2.0, <9.2.6
8.9.19
9.1.13
9.2.6
packagist drupal/graphql
>=4.0.0, <4.2.0
4.2.0

Affected products

  • Drupal Core

Classification

Weakness
  • CWE-284 Improper Access Control
  • CWE-434 Unrestricted Upload of File with Dangerous Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.