Drupal core access bypass vulnerability

published 2021-09-15 5 y ago modified 2026-09-19 50 d ago also BIT-drupal-2020-13677 , DRUPAL-CORE-2021-010 , EUVD-2022-0799 , GHSA-3xr3-phjp-g6p2

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits: 0; none known

Under some circumstances, the Drupal core JSON:API module does not properly restrict access to certain content, which may result in unintended access bypass. Sites that do not have the JSON:API module enabled are not affected.

Patch / fix

fixed in 3 distros 1 links 2

packagist drupal/core 8.9.19, 9.1.13, 9.2.6
bitnami drupal 8.9.19, 9.1.13, 9.2.6
Drupal Core 8.9.19, 9.1.13, 9.2.6

drupal Arch Linux 9.2.6-1

arch linux advisories AVG-2407

github.com/drupal/core@7a9bef4 commit
drupal.org/sa-core-2021-010 advisory

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-2020-13677 updated 2025-11-21

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

1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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

Affected products

Drupal Core

Classification

Weakness

CWE-284 Improper Access Control
CWE-863 Incorrect Authorization

References

drupal.org /sa-core-2021-010
web, patch, vendor-advisory, advisory
github.com /drupal/core/commit/7a9bef4b4750d79ab42498e459012cabe4c4bd8b
web
nvd.nist.gov /vuln/detail/CVE-2020-13677
advisory, web
github.com /drupal/core
package

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.

Summary