User Registration & Membership <= 5.2.8 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via Referer Header via 'referrer_url' Smart Tag

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92798
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-17 04:17:10 UTC
Updated2026-10-17 04:17:10 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-94 | CWE-94 CWE-94 Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wpeverest User Registration Membership Free Paid Memberships Subscriptions Content Restriction User Profile Custom User Registration Login Builder affected 5.2.8 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/ec317df9-c7ef-49a3-9818-903df... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/class-ur-smart-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/modules/content-restrict... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/class-ur-smart-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3741339/user-registration/trunk/includes/class-ur-s... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/modules/content-restrict... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Passakorn Yookindee (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-16T19:59:06.000ZVendor Notified
CNA2026-10-16T14:42:54.000ZDisclosed

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