User Registration <= 4.2.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via urcr_restrict Shortcode
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The User Registration plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's urcr_restrict shortcode in all versions up to, and including, 4.2.4 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| wpeverest | User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder | up to 4.2.4 | — | No fix listed | CNA |
- User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder Vendorwpeverest Affected up to 4.2.4 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-6831
- 2026-10-03 Alias added: GHSA-9c8q-h45m-v3c2
References
Other 5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/50f3e469-f788-45da-95e7-aa6da1e87fd1?source=cve
- https://plugins.trac.wordpress.org/browser/user-registration/tags/4.2.4/modules/content-restriction/class-urcr-shortcodes.php
- https://plugins.trac.wordpress.org/browser/user-registration/tags/4.2.4/modules/content-restriction/class-urcr-shortcodes.php#L147
- https://wordpress.org/plugins/user-registration/#developers
- https://plugins.trac.wordpress.org/changeset/3329704/
More wpeverest vulnerabilities
- TI-2025-00958 Everest Forms <= 3.0.9.4 - Unauthenticated Arbitrary File Upload, Read, and Deletion CVSS 3.1CRITICAL 9.8
- TI-2026-02850 Everest Forms Pro <= 1.9.12 - Unauthenticated Remote Code Execution via Calculation Field CVSS 3.1CRITICAL 9.8
- TI-2026-01188 User Registration & Membership <= 5.1.2 - Unauthenticated Privilege Escalation via Membership Registration CVSS 3.1CRITICAL 9.8
- TI-2025-02262 User Registration & Membership < 4.1.3 - Authentication Bypass CVSS 3.1HIGH 8.1
- TI-2025-02232 User Registration & Membership < 4.1.2- Unauthenticated Privilege Escalation CVSS 3.1HIGH 8.1
- TI-2022-03588 User Registration < 2.2.4.1 - Subscriber+ Arbitrary File Upload CVSS 3.1HIGH 7.5
Sources
- CVE-2025-6831 · CVE Program
- CVE-2025-6831 · NVD
- FIRST EPSS
- GHSA-9c8q-h45m-v3c2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences