HIGH

CVE-2026-100186

Q: What is CVE-2026-100186?

The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via First Name Field in all versions up to, and including, 4.0.3 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. This vulnerability is only exploitable when the Email Confirmation feature is enabled in Profile Builder.

Q: Is CVE-2026-100186 actively exploited?

Active exploitation of CVE-2026-100186 has not been confirmed. Its EPSS score was 0.2% on 2026-10-16, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-100186?

CVE-2026-100186 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

User Profile Builder <= 4.0.3 - Unauthenticated Stored Cross-Site Scripting via First Name Field

CVSS v3

7.2

HIGH

EPSS Score

0.2 %

exploit probability, as of 2026-10-16

CISA KEV

known exploited

Exploitation

none

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-100186 yet.

Full record on NVD

Description

The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via First Name Field in all versions up to, and including, 4.0.3 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. This vulnerability is only exploitable when the Email Confirmation feature is enabled in Profile Builder.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Published: 2026-10-16
Last Modified: 2026-10-16

Frequently asked questions

What is CVE-2026-100186?

Is CVE-2026-100186 actively exploited?

Active exploitation of CVE-2026-100186 has not been confirmed. Its EPSS score was 0.2% on 2026-10-16, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-100186?

CVE-2026-100186 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

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