WP User Frontend Arbitrary Post Overwrite IDOR Vulnerability
The User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership & User Registration plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 4.3.7 via the 'wpuf_files_data' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to overwrite the post_title, post_content, and post_excerpt of any arbitrary post on the site, including posts authored by administrators. Exploitation requires access to any WPUF post submission form; this is achievable by users with no WordPress role, as the wpuf_submit_post AJAX action is gated only by a nonce with no capability check for the downstream post-edit operation.
Browse WordPress security risksQuick answer
WP User Frontend User Frontend should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- User Frontend up to and including 4.3.7
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
WP User Frontend is affected by CVE-2026-12418. Versions up to 4.3.7 can allow unauthenticated content tampering because unauthenticated attackers with access to a WPUF form can overwrite arbitrary post title, content, and excerpt values. Patch the plugin and review posts that may have been modified.
- Inventory WordPress sites using WP User Frontend.
- Update WP User Frontend beyond 4.3.7 when a fixed release is available.
- Disable public WPUF submission forms until the site is patched if immediate update is not possible.
- Review recent post title, content, and excerpt changes for unexpected edits.
- Restore tampered posts from revisions or trusted backups.
- Restrict the affected AJAX action and form endpoints with WAF rules during remediation.
- Clear page and CDN caches after restoring content.
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Verify the fix
- Confirm WP User Frontend is no longer version 4.3.7 or older.
- Attempt a safe post ID substitution test in staging and confirm arbitrary posts cannot be overwritten.
- Confirm legitimate front-end submissions still create or edit only permitted posts.
- Review audit logs and post revisions for further tampering after mitigation.
- Run a Fixnx scan and verify public WordPress exposure is rechecked.
Related categories
Related security risks
More published guidance from the same primary category.
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Trusted references
FAQ
What is affected by CVE-2026-12418?
WP User Frontend User Frontend versions listed as affected should be reviewed: User Frontend up to and including 4.3.7.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.