No exploitation reportedFix available

CVE-2020-13665

Q: Is CVE-2020-13665 actively exploited?

Active exploitation of CVE-2020-13665 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-13665?

CVE-2020-13665 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-05-05
Fixed in9.0.1 · 8.9.1 · 8.8.8

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2021-05-0515:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-13665?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-13665?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Drupal

Branch	Affected	Fixed in	Source
9.0	≥ 9.0.0, < 9.0.1	9.0.1	NVD · OSV
8.9	≥ 8.9.0, < 8.9.1	8.9.1	NVD · OSV
8.8	≥ 8.8.0, < 8.8.8	8.8.8	NVD · OSV
8.x	≥ 8.0.0, < 8.8.8	8.8.8	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Drupal to 9.0.1 · 8.9.1 · 8.8.8

Advisories and patches

www.drupal.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
FIRST EPSSEPSS score1.3 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2021-05-05
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-13665?

Is CVE-2020-13665 actively exploited?

Active exploitation of CVE-2020-13665 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-13665?

CVE-2020-13665 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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