#VU19650 Arbitrary file upload in Ultimate Member - User Profile & Membership Plugin

Vulnerability identifier: #VU19650

Vulnerability risk: High

CVSSv4.0: 8.1 [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:U/U:Amber]

CVE-ID: N/A

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ultimate Member - User Profile & Membership Plugin
Web applications / Modules and components for CMS

Vendor: Ultimate Member

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file extension when uploading files. A remote attacker can upload and execute arbitrary file on the system.

Mitigation
Update to version 2.0.22.

Vulnerable software versions

Ultimate Member - User Profile & Membership Plugin: 1.0.0 - 2.0.21

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External links
https://wordpress.org/support/topic/appears-um-got-hacked-on-my-site/
https://wordpress.org/support/topic/danger-security-issue/
https://plugins.trac.wordpress.org/changeset/1922149/ultimate-member

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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?

No. We are not aware of malware exploiting this vulnerability.