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CVE-2026-18983

HIGH 7.5 CVSS 3.1
Published
August 28, 2026
Last modified
August 28, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-434
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

The One User Avatar | User Profile Picture plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.5.4 via the wpua_action_process_option_update function. This is due to insufficient file type validation in wp_handle_upload() called without a MIME allow-list, with post-write validation relying on the attacker-controlled client-supplied Content-Type header rather than a server-derived type, and no cleanup of files that fail the check. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. in order to exploit this vulnerability an admin has to give subscribers permission to upload avatars. While PHP files and svg files are rejected, dxfp files are accepted.

Affected WordPress components

  • One User Avatar | User Profile Picture Plugin · one-user-avatar
    Confirmed match Active
    Up to and including 2.5.4
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • onedesigns One User Avatar | User Profile Picture — Up to and including 2.5.4

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/one-user-avatar/trunk/includes/class-wp-user-avatar.php#L45
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/one-user-avatar/trunk/includes/class-wp-user-avatar.php#L546
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/one-user-avatar/trunk/includes/class-wp-user-avatar.php#L549
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3659509/one-user-avatar/trunk/includes/class-wp-user-avatar.php
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?old_path=%2Fone-user-avatar/tags/2.5.4&new_path=%2Fone-user-avatar/tags/2.5.5
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/f413b610-839a-4a93-aec5-b6566371ccb7?source=cve
  • nvd.nist.gov Official NVD record