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CVE-2026-19125 – Authentication Bypass – EthPress Web3 Login WordPress Plugin (≤ 2.3.5)

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Summary

CVE-2026-19125 is an unauthenticated authentication bypass vulnerability (CWE-287: Improper Authentication) affecting the EthPress – Web3 Login WordPress plugin, versions up to and including 2.3.5. A missing return statement in the plugin’s wallet-signature verification logic allows an attacker to bypass Ethereum wallet signature checks and log in as an arbitrary WordPress user, including administrators. The flaw carries a CVSS v3.1 base score of 8.1 (High).

Technical details

  • Root cause: The verify_login() function in app/Login.php builds a WP_Error object when wallet signature verification fails but does not return afterward, so execution falls through to the authentication code path even though verification failed.
  • Trigger conditions: An attacker submits a login request through the plugin’s AJAX login endpoint using an invalid or empty signature for a wallet address that is already linked to a target WordPress account (stored in wp_usermeta under the ethpress meta key).
  • Attack flow: After the verification check silently fails to halt execution, the plugin’s Address::log_in() routine resolves the supplied wallet address to its associated WordPress user and calls wp_set_auth_cookie(), issuing a valid authenticated session for that user without requiring a legitimate cryptographic signature.
  • Attack vector: Network-based; the request can be sent unauthenticated over HTTP(S) to the site’s login/AJAX handlers, requiring no user interaction and no prior authentication (AV:N, AC:H, PR:N, UI:N).
  • Impact: Full compromise of confidentiality, integrity, and availability of the affected WordPress site is possible if the targeted account is an administrator, since the attacker gains a genuine authenticated session and inherits that account’s privileges.

Affected software

  • EthPress – Web3 Login WordPress plugin, versions up to and including 2.3.5
  • Fixed in version 2.3.6

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update EthPress – Web3 Login to version 2.3.6 or later, which restores the missing return statement so signature verification failures correctly halt the login process.
  • If immediate patching is not possible:
    • Disable the EthPress wallet-login functionality or deactivate the plugin entirely until the patch can be applied.
    • Audit the wp_usermeta table for rows with meta_key = 'ethpress' associated with privileged (administrator) accounts, and review authentication logs for unexpected admin logins originating from wallet-based authentication.
    • Restrict or monitor access to the plugin’s login AJAX endpoint at the network layer where feasible until patched.

References

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