User Submitted Posts <= 20260113 - Incorrect Authorization to Unauthenticated Category Restriction Bypass via 'user-submitted-category' Parameter

Incorrect Authorization
CVE CVE-2026-2126
CVSS Medium (5.3)
Publicly Published February 17, 2026
Last Updated February 18, 2026
Researcher type5afe
Description

The User Submitted Posts – Enable Users to Submit Posts from the Front End plugin for WordPress is vulnerable to Incorrect Authorization in all versions up to, and including, 20260113. This is due to the `usp_get_submitted_category()` function accepting user-submitted category IDs from the POST body without validating them against the admin-configured allowed categories stored in `usp_options['categories']`. This makes it possible for unauthenticated attackers to assign submitted posts to arbitrary categories, including restricted ones, by crafting a direct POST request with manipulated `user-submitted-category[]` values, bypassing the frontend category restrictions.

References

1 affected software package

Software Type Plugin
Software Slug user-submitted-posts (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 20260113
Patched Version
  • 20260217
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