Vulnerability in Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress — CVE-2026-104003
What to do now
Update Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress to 4.17.6 or later.
Affected versions
- Everything up to and including 4.17.5
Affected: Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress (plugin, wp-user-avatar)
What the vulnerability is
The WP User Avatar / ProfilePress plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 4.17.5. This is due to the get_user_profile_structure() function assembling the front-end profile buffer — which includes raw comment excerpts inlined by author_comment_query() — and passing the entire buffer to do_shortcode() after only a narrow neutralization pass (ppress_neutralize_buffer_shortcodes) that blocks pp-custom-html and bracket fragments containing HTML delimiters but leaves any other well-formed shortcode intact. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary shortcodes (from any active plugin or theme) with attacker-chosen attributes by posting a comment whose body contains the shortcode markup; the shortcode is then executed server-side when any visitor loads the target's front-end profile Comments tab, letting the attacker reach capability-gated or data-returning shortcodes and inject raw HTML markup into a publicly viewable page.
Sources
- https://pastebin.com/raw/pCgrW6Pf
- https://plugins.trac.wordpress.org/browser/wp-user-avatar/tags/4.17.5/src/Functions/GlobalFunctions.php#L1768
- https://plugins.trac.wordpress.org/browser/wp-user-avatar/tags/4.17.5/src/ShortcodeParser/Builder/FrontendProfileBuilder.php#L169
- https://plugins.trac.wordpress.org/browser/wp-user-avatar/tags/4.17.5/src/ShortcodeParser/FrontendProfileTag.php#L142
- https://plugins.trac.wordpress.org/browser/wp-user-avatar/tags/4.17.5/src/Themes/DragDrop/UserProfile/DefaultTemplate.php#L379
- https://plugins.trac.wordpress.org/browser/wp-user-avatar/tags/4.17.6/src/ShortcodeParser/FrontendProfileTag.php