What is the CVSS score of EUVD-2026-91876?

EUVD-2026-91876 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.2%.

Which versions of Ultimate Member are affected by EUVD-2026-91876?

The Ultimate Member WordPress plugin, used for user registration and membership management, contains a stored cross-site scripting vulnerability (CVE-2026-96270) in versions through 2.13.1.

How to fix or mitigate EUVD-2026-91876?

No vendor-released patch identified at time of analysis. Within 24 hours, inventory all WordPress installations running the Ultimate Member plugin at version 2.13.1 or earlier and determine if user registration or profile forms are publicly accessible; if not essential, temporarily disable the plugin. Within 7 days, deploy a web application firewall (WAF) rule to block malicious 'form_id' parameters in form submissions and restrict access to registration and profile forms to trusted IP ranges where feasible. Within 30 days, continue monitoring the vendor's advisory for a patch release and apply it immediately when available; meanwhile, conduct a review of administrator accounts and user records for signs of compromise, and consider replacing the plugin with a secure alternative if a patch is not forthcoming.

Ultimate Member EUVD-2026-91876

| CVE-2026-96270 HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-10-03 Wordfence

GHSA-6phc-8h2j-74hw

WordPress XSS Ultimate Member User Profile Registration Login Member Directory Content Restriction Membership Plugin Wordpress Plugin Ultimatemember

7.2

CVSS 3.1 · Vendor: Wordfence

Severity by source

Vendor (Wordfence) PRIMARY

7.2 HIGH

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

vuln.today AI

6.1 MEDIUM

Injection is remote and unauthenticated (AV:N/PR:N), but execution needs an admin to open the user modal (UI:R); XSS fires in the admin's session, crossing authority (S:C) with limited C/I and no availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Wordfence).

CVSS VectorVendor: Wordfence

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Oct 03, 2026 - 03:01 vuln.today

CVE Published

Oct 03, 2026 - 02:25 cve.org

HIGH 7.2

DescriptionCVE.org

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 'form_id' parameter in all versions up to, and including, 2.13.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload is stored in the registering user's 'submitted' usermeta via update_user_meta() and is only triggered when an administrator opens the affected user record in the wp-admin Users modal, which inserts the unescaped output via jQuery .html().

AnalysisAI

Stored cross-site scripting in the Ultimate Member WordPress plugin (User Profile, Registration, Login, Member Directory, Content Restriction & Membership) through version 2.13.1 lets unauthenticated attackers inject arbitrary JavaScript into the 'form_id' parameter of a form submission; the payload is persisted unescaped into the registering user's 'submitted' usermeta via update_user_meta() and only executes when an administrator opens that specific user record in the wp-admin Users modal, where the stored value is inserted through jQuery .html(). The CVSS vector (AV:N/AC:L/PR:N, scope-changed) reflects that the script runs in the privileged admin context, but practical exploitation depends on anonymous users being able to reach a UM registration/profile form and on an administrator subsequently viewing the poisoned user record, so it is a conditionally-triggered issue rather than a drive-by compromise. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation	Requires a site running Ultimate Member ≤2.13.1 with an Ultimate Member registration/profile form reachable by anonymous users; the attacker injects script into the 'form_id' parameter during form submission, which is stored unescaped in the registering user's 'submitted' usermeta via update_user_meta(). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	This is a genuine but conditionally-triggered issue rather than a drive-by catastrophe. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation	Upgrade to Ultimate Member 2.14.0 or later; the 2.14.0 release notes explicitly record that this CVE was fixed by adding sanitizing for the form_id attribute during Ultimate Member forms submission, so the vendor-released patch version is 2.14.0 (https://github.com/ultimatemember/ultimatemember/releases/tag/2.14.0). … Detailed patch versions, workarounds, and compensating controls in full report.