CVE-2026-92798 Details
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.
A vulnerability allowing arbitrary shortcode execution has been identified in the User Registration & Membership plugin for WordPress, affecting versions through 5.2.8. The issue arises from inadequate input sanitization in the 'referrer_url' branch of the UR_Smart_Tags::process() method. Here, the attacker-controlled HTTP_REFERER header is only lightly sanitized, allowing WordPress shortcode delimiters to remain intact. This unsanitized input is then inserted into a Content Restriction message, which is executed as a shortcode. As a result, unauthenticated attackers can execute any registered shortcode on restricted pages that utilize the {{referrer_url}} smart tag.
Users are advised to update the User Registration & Membership plugin to version 5.3.0 or later.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 17, 2026CISA-ADP
Assessed Oct 18, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| User Registration & Membership | <= 5.2.8 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 18, 2026 | CVE Modified | CISA-ADP |
| Oct 17, 2026 | New CVE Received | [email protected] |