CVE-2021-29447 WordPress Authenticated XXE attack when installation is running PHP 8

2021-04-1521:10:12

CWE-611

GitHub_M

www.cve.org

cve-2021-29447

wordpress

xxe attack

php 8

media library

auto-updates

CVSS3

7.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

AI Score

6.7

Confidence

High

EPSS

0.027

Percentile

90.7%

JSON

Wordpress is an open source CMS. A user with the ability to upload files (like an Author) can exploit an XML parsing issue in the Media Library leading to XXE attacks. This requires WordPress installation to be using PHP 8. Access to internal files is possible in a successful XXE attack. This has been patched in WordPress version 5.7.1, along with the older affected versions via a minor release. We strongly recommend you keep auto-updates enabled.

CNA Affected

[
  {
    "product": "wordpress-develop",
    "vendor": "WordPress",
    "versions": [
      {
        "status": "affected",
        "version": ">= 5.6.0, < 5.7.1"
      }
    ]
  }
]