CVE-2020-13675Network attack vector

File-validation bypass via HTTP API uploads

Published Feb 11, 2022 · Updated Aug 4, 2024

Access bypass in Drupal core 8.0.0 through 8.9.18, 9.1.0 through 9.1.12, and 9.2.0 through 9.2.5 allows attackers to upload unvalidated files. The JSON:API and REST/File upload paths accept files without running every validation imposed by site modules. Exploitation requires an enabled upload module, access to its upload API, and a site that employs an additional file-validation module.

CVSS severity9.8
Critical
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access bypass in Drupal core 8.0.0 through 8.9.18, 9.1.0 through 9.1.12, and 9.2.0 through 9.2.5 allows attackers to upload unvalidated files. The JSON:API and REST/File upload paths accept files without running every validation imposed by site modules. Exploitation requires an enabled upload module, access to its upload API, and a site that employs an additional file-validation module.

The record

CVE
CVE-2020-13675
Published
Feb 11, 2022
Updated
Aug 4, 2024
Vendor
OAuth.js
Product
Drupal core
Classifications
CWE-434, CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.9.x <8.9.19
  2. Affected versionversion=9.1.x <9.1.13
  3. Affected versionversion=9.2.x <9.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OAuth.js · Drupal coreversion=8.9.x <8.9.19; version=9.1.x <9.1.13; version=9.2.x <9.2.6

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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