CVE-2021-29447CWE-611

WordPress Authenticated XXE attack when installation is running PHP 8

High · published April 15, 2021

Patch now

High probability of exploitation

CVSS calls it high at 7.1. It sits in the 99.7th percentile for exploit probability.

CVSS v3.1

7.1

EPSS

86%

Percentile

99.7

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 7.1 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CVSS v4.0: Not supplied
EPSS: 0.85719 · 99.7th percentile
Weakness: CWE-611 · Improper Restriction of XML External Entity Reference
Published: 2021-04-15T21:10Z

EPSS history

Timeline

15 APR 21:10Z
WordPress Authenticated XXE attack when installation is running PHP 8
cvelistv5