The User Registration & Membership plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 5.2.8 This is due to insufficient input sanitization in the 'referrer_url' branch of UR_Smart_Tags::process(), where the attacker-controlled HTTP_REFERER header is only passed through sanitize_text_field() — which does not strip WordPress shortcode delimiters — before being substituted into a Content Restriction message that is subsequently executed via apply_shortcodes()/do_shortcode(). This makes it possible for unauthenticated attackers to execute arbitrary registered shortcodes on any restricted page whose message uses the supported {{referrer_url}} smart tag.
History

Wed, 21 Oct 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Wordpress-extensions
Wordpress-extensions user Registration & Membership
Wpeverest
Wpeverest user Registration & Membership
Vendors & Products Wordpress-extensions
Wordpress-extensions user Registration & Membership
Wpeverest
Wpeverest user Registration & Membership

Sun, 18 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sat, 17 Oct 2026 04:00:00 +0000

Type Values Removed Values Added
Description The User Registration & Membership plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 5.2.8 This is due to insufficient input sanitization in the 'referrer_url' branch of UR_Smart_Tags::process(), where the attacker-controlled HTTP_REFERER header is only passed through sanitize_text_field() — which does not strip WordPress shortcode delimiters — before being substituted into a Content Restriction message that is subsequently executed via apply_shortcodes()/do_shortcode(). This makes it possible for unauthenticated attackers to execute arbitrary registered shortcodes on any restricted page whose message uses the supported {{referrer_url}} smart tag.
Title User Registration & Membership <= 5.2.8 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via Referer Header via 'referrer_url' Smart Tag
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published: 2026-10-17T03:43:31.068Z

Updated: 2026-10-18T11:22:46.165Z

Reserved: 2026-09-16T19:44:13.265Z

Link: CVE-2026-92798

cve-icon Vulnrichment

Updated: 2026-10-18T11:15:18.347Z

cve-icon NVD

Status : Deferred

Published: 2026-10-17T04:17:10.257

Modified: 2026-10-19T15:16:45.150

Link: CVE-2026-92798

cve-icon Redhat

No data.