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0xCERT Security Advisory 0xCERT-2026-0179
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Advisory-ID:  0xCERT-2026-0179
Severity:     High
Published:    2026-09-23T22:16:56.683Z
Updated:      2026-10-08T22:46:38.116Z
Chains:       Ethereum
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0179

Title: CVE-2026-19125: The EthPress – Web3 Login plugin for WordPress

Summary
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The EthPress – Web3 Login plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.3.5. This is due to the verify_login() function in app/Login.php containing a missing return statement in the signature verification failure branch — when Signature::verify2() reports a mismatch, the function only assigns a WP_Error to a local variable and continues executing, causing unconditional fall-through to the login block where Address::log_in() calls wp_set_auth_cookie() regardless of whether the submitted signature is valid. This makes it possible for unauthe…

Details
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Summary
The EthPress – Web3 Login plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.3.5. This is due to the verify_login() function in app/Login.php containing a missing return statement in the signature verification failure branch — when Signature::verify2() reports a mismatch, the function only assigns a WP_Error to a local variable and continues executing, causing unconditional fall-through to the login block where Address::log_in() calls wp_set_auth_cookie() regardless of whether the submitted signature is valid. This makes it possible for unauthenticated attackers to log in as any WordPress user who has a linked wallet address — including administrators — by submitting that user's public wallet address alongside an arbitrary well-formed signature, enabling full site takeover.

Severity
High (CVSS 8.1), as scored by NVD.

Weakness
- - CWE-287

Recommended actions
- - Check whether you run or depend on the affected component and version
- - Apply the vendor's fix or mitigation from the references below

Source & attribution
This 0xCERT advisory summarises CVE-2026-19125 from the U.S. National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2026-19125. Details may change; refer to the original source for the authoritative record.

References
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- - https://nvd.nist.gov/vuln/detail/CVE-2026-19125
- - https://plugins.trac.wordpress.org/browser/ethpress/tags/2.3.5/app/Address.php#L419
- - https://plugins.trac.wordpress.org/browser/ethpress/tags/2.3.5/app/Login.php#L46
- - https://plugins.trac.wordpress.org/browser/ethpress/tags/2.3.5/app/Login.php#L51
- - https://plugins.trac.wordpress.org/browser/ethpress/tags/2.3.5/app/Plugin.php#L75
- - https://plugins.trac.wordpress.org/changeset/3683106/ethpress/trunk/app/Login.php
- - https://www.wordfence.com/threat-intel/vulnerabilities/id/267acbd7-379c-4930-aa85-3071dfcac5a5?source=cve

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