CVE-2021-29447

Public Exploit
WordPress Authenticated XXE attack when installation is running PHP 8

Description

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.

Category

7.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 85.02% Top 5%
Vendor Advisory debian.org Vendor Advisory wordpress.org
Affected: WordPress wordpress-develop
Published at:
Updated at:

References

Link Tags
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhh third party advisory
https://wordpress.org/news/category/security/ release notes vendor advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00017.html third party advisory mailing list
https://www.debian.org/security/2021/dsa-4896 third party advisory vendor advisory
http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.html third party advisory vdb entry
http://packetstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.html third party advisory vdb entry exploit
https://blog.sonarsource.com/wordpress-xxe-security-vulnerability/ third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-29447?
CVE-2021-29447 has been scored as a high severity vulnerability.
How to fix CVE-2021-29447?
To fix CVE-2021-29447, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-29447 being actively exploited in the wild?
It is possible that CVE-2021-29447 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~85% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-29447?
CVE-2021-29447 affects WordPress wordpress-develop.
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