CVE Intelligence
Analysis AI-assisted

CVE-2026-12417: SignUp & SignIn WordPress Plugin: Authentication Bypass via Weak Password Reset Validation

The SignUp & SignIn plugin for WordPress, in versions up to and including 1.0.0, performs a weak check during password reset that can be abused without logging in. According to the record, an unauthenticated attacker could change the password of any user, including administrators, and take over the account. The record reports no KEV listing and no confirmed exploitation in the sources consulted, and it provides no fixed version.

Published Oct 13, 2026 · Updated Oct 13, 2026 · Ler em português

Overview

The SignUp & SignIn plugin for WordPress contains an authentication bypass weakness in its password reset handling, tracked as CVE-2026-12417 and classified as CWE-640 (Weak Password Recovery Mechanism). According to the record, the flaw affects versions up to and including 1.0.0. The vulnerable logic is in an AJAX handler that is reachable without authentication and does not properly validate the reset check before changing a password.

Impact

  • Unauthenticated attackers may be able to change the password of any WordPress account, including administrators.
  • A successful password change would allow the attacker to sign in as the affected user and take over the account.
  • Because administrator accounts are in scope, the record describes possible administrator-level privilege escalation on the affected site.
  • The CVSS 3.1 base score recorded by the CNA is 9.8 (vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), reflecting high confidentiality, integrity and availability impact over the network without privileges or user interaction.

Affected products and versions

  • Product: SignUp & SignIn plugin for WordPress.
  • Versions up to and including 1.0.0 are described as vulnerable.
  • The structured affected list in the record is empty, so the exact range and any later fixed release are unknown from the data provided.

Exploitation status

  • The CISA KEV entry in the record is marked as not listed, so this analysis does not describe the issue as actively exploited.
  • No confirmed exploitation appears in the sources consulted for this analysis.
  • The record status is Deferred, which means enrichment is incomplete.

Remediation and mitigation

  • Identify whether the SignUp & SignIn plugin is installed on any WordPress site and check its version.
  • If the plugin is present, consider deactivating and removing it until a fixed version from the plugin maintainer is confirmed.
  • Review the Wordfence advisory for the latest guidance from the reporting party.
  • After any remediation, reset passwords for administrator and other privileged accounts and review recent account activity, since credentials may have been changed before the fix.
  • Use strong, unique passwords and multi-factor authentication for administrative accounts as a general hardening measure.

Detection guidance

  • Review web server and WordPress logs for unexpected POST requests to admin-ajax.php from unauthenticated sources, especially those involving the plugin's password-related action.
  • Look for password changes or successful logins to administrator accounts that do not match known administrative activity.
  • Monitor for new administrator accounts or unexpected role changes.
  • Treat these indicators as starting points, since the record does not publish indicators of compromise.

Limitations of the available information

  • The record does not list fixed versions or a vendor patch status.
  • The structured affected list is empty; only the description references versions up to and including 1.0.0.
  • The record was assembled from NVD and CNA data and is marked Deferred, so details may change.
  • The record does not include exploitation timeline, public proof-of-concept status, or vendor response.

Frequently asked questions

Which versions of the SignUp & SignIn plugin are described as vulnerable?

The record describes versions up to and including 1.0.0 as vulnerable. The structured affected list is empty, so no further range is confirmed.

Can an unauthenticated attacker exploit this issue?

The record states that the vulnerable handler is reachable by unauthenticated users and lacks nonce and capability checks. This means the description indicates no login is required, but no exploitation activity is confirmed in the sources consulted.

Is there a fixed version available?

The record does not list a fixed version. Administrators should check the plugin maintainer and the Wordfence advisory and consider removing the plugin until a fix is confirmed.

This analysis was drafted with AI assistance from verified source data and automatically checked against it.