Improper access control in WordPress - CVE-2020-28039

 

Improper access control in WordPress - CVE-2020-28039

Published: October 30, 2020 / Updated: November 9, 2020


Vulnerability identifier: #VU48039
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-28039
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain unauthorized access to delete arbitrary files.

The vulnerability exists due to improper access restrictions in is_protected_meta in wp-includes/meta.php. A remote attacker can bypass implemented security restrictions and delete arbitrary files.


Affected software

WordPress
Arch Linux
Fedora
wordpress (Debian package)
wordpress

How to mitigate CVE-2020-28039

Install updates from vendor's website.

WordPress - update to 5.5.2
wordpress (Debian package) - update to 5.0.11+dfsg1-0+deb10u1
wordpress - addressed in versions 5.1.8-1.el6, 5.1.8-1.el7, 5.5.3-1.fc31, 5.5.3-1.fc32, 5.5.3-1.fc33

External References

Related Security Bulletins