WordPress plugin

YITH Easy Login & Register Popup for WooCommerce <= 1.8.0 — Authentication Bypass via Password Reset

CVE-2021-39331Published Sep 20, 2021 · Updated Nov 13, 2026

Affected: ≤1.8.0Update to 1.8.1 or newer

All remediation steps

Watch plugin

Severity

Critical9.8

CVSS

9.8

CVSS 3.1 · CNA (Wordfence)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What does this vector mean?

AV:N Attack vector: Network
AC:L Attack complexity: Low
PR:N Privileges required: None
UI:N User interaction: None
S:U Scope: Unchanged
C:H Confidentiality: High
I:H Integrity: High
A:H Availability: High

Weakness

CWE-639 Authorization Bypass Through User-Controlled Key

Required access

No account needed

Exploit prediction (EPSS)

No score

CISA KEV

Not listed

On this page7

Am I affected?

YITH Easy Login & Register Popup for WooCommerce yith-easy-login-register-popup-for-woocommerce

Affected≤ 1.8.0
Patched in1.8.1

You are affected if you run ≤ 1.8.0. Version 1.8.1 and later are not affected by this issue.

Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under YITH Easy Login & Register Popup for WooCommerce.
No admin access? Run a passive check of your site. It reads public files only.
No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

Update to version 1.8.1, or a newer patched version
Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
Watch YITH Easy Login & Register Popup for WooCommerce to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence.

The YITH Easy Login & Register Popup for WooCommerce plugin for WordPress is vulnerable to authorization bypass via password reset in versions up to, and including, 1.8.0. This is due to the plugin failing to properly validate if a user is authorized to perform a password reset for the supplied user_login via the yith_welrp_form_action AJAX. This makes it possible for unauthenticated users to reset administrators password and then log in to a site using that account.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

Advisorywordfence.com

Timeline

Sep 20, 2021
CVE published
Severity critical, CVSS 9.8
Nov 13, 2026
Record last updated

Sources & licenses

Wordfence record

Vulnerability data: Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers: [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE: National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.

How we use these sources