CVE-2020-13677
Drupal core access bypass vulnerability
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2020-13677- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:P/I:N/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
CVE ListNo score
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.
- Record
CVE-2020-13677- Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2022-0799No score
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.
- Record
EUVD-2022-0799- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3xr3-phjp-g6p2
Drupal core access bypass vulnerability
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.
- Record
GHSA-3xr3-phjp-g6p2- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-284, CWE-863
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2020-13677- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-3xr3-phjp-g6p2
Drupal core access bypass vulnerability
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.
- Record
GHSA-3xr3-phjp-g6p2- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-284, CWE-863
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2020-13677
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.
- Record
UBUNTU-CVE-2020-13677- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVBIT-drupal-2020-13677No score
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.
- Record
BIT-drupal-2020-13677- Updated
- 2026-11-02
OSVDRUPAL-CORE-2021-010No score
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.
This advisory is not covered by Drupal Steward.
- Record
DRUPAL-CORE-2021-010- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
drupal/corePackagist | 8.0.0 up to 8.9.19 | 8.9.19 |
drupal/corePackagist | 9.1.0 up to 9.1.13 | 9.1.13 |
drupal/corePackagist | 9.2.0 up to 9.2.6 | 9.2.6 |
drupalBitnami | 8.0.0 up to 8.9.19, 9.1.0 up to 9.1.13, 9.2.0 up to 9.2.6 | 8.9.199.1.139.2.6 |
drupal/corePackagist | 8.0.0 up to 8.9.19, 9.1.0 up to 9.1.13, 9.2.0 up to 9.2.6, 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 | 8.9.199.1.139.2.6 |
drupal/corePackagist | 8.0.0 up to 8.9.19, 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 | 8.9.19 |
drupal/corePackagist | 9.1.0 up to 9.1.13, plus listed versions 9.1.19.1.109.1.119.1.129.1.2 Show 7 moreShow less9.1.39.1.49.1.59.1.69.1.79.1.89.1.9 | 9.1.13 |
drupal/corePackagist | 9.2.0 up to 9.2.6, plus listed versions 9.2.19.2.29.2.39.2.49.2.5 | 9.2.6 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| affected | ||
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-13677 is a high vulnerability (CVSS 7.5) in Drupal Core, published September 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.22%, the 69th percentile. Fixed in drupal/core 8.9.19.
References
Left out here: 241 versions. The JSON record has them.