What is CVE-2020-13675?

CVE-2020-13675 is a critical-severity vulnerability in Drupal Core, classified under Improper Access Control. CVSS score: 9.8/10. Published 2022-02-11.

How severe is CVE-2020-13675?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Drupal Core

CVE-2020-13675

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.

Published 2022-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.014 · change: +0.001

Affected products

Drupal Core — versions 9.2.x, 9.1.x, 8.9.x
Drupal

Weakness classification (CWE)

References

www.drupal.org/sa-core-2021-008 (Patch, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2020-13675?: CVE-2020-13675 is a critical-severity vulnerability in Drupal Core, classified under Improper Access Control. CVSS score: 9.8/10. Published 2022-02-11.
How severe is CVE-2020-13675?: Critical severity. CVSS v3 base score is 9.8 out of 10.