CVE WatchOct 19, 2026

CVE-2026-92798

The User Registration & Membership plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 5.2

CVSS

8.1

High

EPSS

0.4%

p29

KEV

—

Exploit Today

0-100

Published: Oct 17, 2026 · Last modified: Oct 19, 2026 · CWE-94

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-10-172026-10-20

Technical 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.

Official references

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