Cross-site scripting in ultimatemember Ultimate Member – User Profile, Registration…
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 Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'about_me' parameter in all versions up to, and including, 2.11.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-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 |
|---|---|---|---|---|---|
| ultimatemember | Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin | up to 2.11.4 | — | No fix listed | CNA |
- Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin Vendorultimatemember Affected up to 2.11.4 Fixed in — No fix listed CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ultimatemember:ultimate_member:*:*:*:*:*:*:*:* | — | — | ultimatemember |
- cpe:2.3:a:ultimatemember:ultimate_member:*:*:*:*:*:*:*:* Versions — — ·ultimatemember
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-8489
- 2026-10-03 Alias added: GHSA-whj4-pc5c-c7xq
References
Other 11
- https://www.wordfence.com/threat-intel/vulnerabilities/id/229a4e61-571c-44c6-9972-4dfc743afffe?source=cve
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/um-filters-fields.php#L271
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/class-profile.php#L479
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/class-fields.php#L4577
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/class-form.php#L854
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/um-actions-form.php#L628
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/um-filters-fields.php#L271
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-profile.php#L479
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-fields.php#L4577
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-form.php#L854
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/um-actions-form.php#L628
More ultimatemember vulnerabilities
- TI-2024-00992 SQL injection in ultimatemember Ultimate Member – User Profile, Registration, Login… CVSS 3.1CRITICAL 9.8
- TI-2023-03232 Ultimate Member < 2.6.7 - Unauthenticated Privilege Escalation CVSS 3.1CRITICAL 9.8
- TI-2022-03726 JobBoardWP < 1.2.2 - Unauthenticated Arbitrary File Upload CVSS 3.1HIGH 7.5
- TI-2020-19304 WordPress Plugin ultimate-member 2.1.3 Local File Inclusion CVSS 4.0MEDIUM 6.8
- TI-2024-01973 Ultimate Member <= 2.8.3 - Unauthenticated Stored Cross-Site Scripting CVSS 3.1HIGH 7.2
- TI-2020-18475 An issue was discovered in the Ultimate Member plugin before 2.1.12 for WordPress, aka… CVSS 3.1CRITICAL 10.0
Sources
- CVE-2026-8489 · CVE Program
- CVE-2026-8489 · NVD
- FIRST EPSS
- GHSA-whj4-pc5c-c7xq · 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