CVE-2021-29447

HIGH severity · CVSS 7.1 · XML external entity (XXE)

7.1CVSS HIGH

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactHigh

Integrity impactLow

Availability impactNone

Exploit probability (EPSS)91%

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

Affected products we track (1)

WordPress

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Additional information

NVD record
https://wordpress.org/news/category/security/Advisory
http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.htmlAdvisory
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhhAdvisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00017.htmlAdvisory
https://www.debian.org/security/2021/dsa-4896Advisory
http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.htmlAdvisory
http://packetstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.htmlAdvisory
https://blog.sonarsource.com/wordpress-xxe-security-vulnerability/Advisory