CVE-2026-92798 json
User Registration & Membership <= 5.2.8 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via Referer Header via 'referrer_url' Smart Tag
published 2026-10-17 23 d ago modified 2026-10-19 21 d ago also EUVD-2026-103233
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 22 d ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected products
- wpeverest User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/ec317df9-c7ef-49a3-9818-903dfe4bdd03?source=cve
- plugins.trac.wordpress.org /browser/user-registration/tags/5.2.8/includes/class-ur-smart-tags.php#L475
- plugins.trac.wordpress.org /browser/user-registration/tags/5.2.8/includes/class-ur-smart-tags.php#L474
- plugins.trac.wordpress.org /browser/user-registration/tags/5.2.8/modules/content-restriction/class-urcr-frontend.php#L1383
- plugins.trac.wordpress.org /browser/user-registration/tags/5.2.8/modules/content-restriction/functions-urcr-core.php#L693
- plugins.trac.wordpress.org /changeset/3741339/user-registration/trunk/includes/class-ur-smart-tags.php
Sources
- CVE List CVE-2026-92798
- NVD CVE-2026-92798
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