Critical severity · published May 2, 2026
CVE-2026-4882
User Registration Advanced Fields <= 1.6.20 - Unauthenticated Arbitrary File Upload
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
The User Registration Advanced Fields plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'URAF_AJAX::method_upload' function in all versions up to, and including, 1.6.20. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. Note: The vulnerability can only be exploited if a "Profile Picture" field is added to the form.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UR
User Registration Advanced Fields · WPEverest
through 1.6.20 · source: vendor
Affected product
UR
User Registration Advanced Fields
WPEverest
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4882
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4882
wpuserregistration.com
https://wpuserregistration.com/features/advanced-fields/
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/f2c6a377-216f-4d61-8fae-ec5bc2793cdf?source=cve