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Fencer Vulns
critical 9.8

CVE-2020-13665 json

Drupal Core Access bypass vulnerability

published 2021-05-05 5 y ago modified 2026-09-08 2 mo ago also BIT-drupal-2020-13665 , EUVD-2022-5673 , GHSA-wxqp-jwc9-g39x

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Access bypass vulnerability in Drupal Core allows JSON:API when JSON:API is in read/write mode. Only sites that have the read_only set to FALSE under jsonapi.settings config are vulnerable. This issue affects: Drupal Drupal Core 8.8.x versions prior to 8.8.8; 8.9.x versions prior to 8.9.1; 9.0.x versions prior to 9.0.1.

Patch / fix

  • packagist drupal/core 8.8.8, 8.9.1, 9.0.1
  • packagist drupal/drupal 8.8.8, 8.9.1, 9.0.1
  • bitnami drupal 8.8.8, 8.9.1, 9.0.1
  • Drupal Drupal Core 8.8.8, 8.9.1, 9.0.1

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-2020-13665 updated cvss 5.9

drupal: Access bypass vulnerability in Drupal Core

  • 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

1.27% chance of exploitation in the next 30 days, higher than 70% 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
>=8.8.0, <8.8.8
>=8.9.0, <8.9.1
>=9.0.0, <9.0.1
8.8.8
8.9.1
9.0.1
packagist drupal/drupal
>=8.8.0, <8.8.8
>=8.9.0, <8.9.1
>=9.0.0, <9.0.1
8.8.8
8.9.1
9.0.1
bitnami drupal
>=8.8.0, <8.8.8
>=8.9.0, <8.9.1
>=9.0.0, <9.0.1
8.8.8
8.9.1
9.0.1

Affected products

  • Drupal Drupal Core

Classification

Weakness

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.