Improper authorization in Ultimate Member plugin for WordPress

1) Improper Authorization

EUVDB-ID: #VU77841

Risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2023-3460

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise the affected website.

The vulnerability exists due to improper authorization within the registration functionality. A remote non-authenticated attacker can register a rouge administrative account and compromise the web application.

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Ultimate Member - User Profile & Membership Plugin: 2.6.3 - 2.6.5

CPE2.3

• cpe:2.3:a:ultimatemember:ultimate-member:2.6.3:*:*:*:*:wordpress:*:*
• cpe:2.3:a:ultimatemember:ultimate-member:2.6.4:*:*:*:*:wordpress:*:*
• cpe:2.3:a:ultimatemember:ultimate-member:2.6.5:*:*:*:*:wordpress:*:*

External links

https://wordpress.org/support/topic/security-issue-144/#post-16859857
https://www.bleepingcomputer.com/news/security/hackers-exploit-zero-day-in-ultimate-member-wordpress-plugin-with-200k-installs/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.