EUVD-2026-50111
GHSA-45wh-rxq4-jqc6
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Remote unauthenticated request with no interaction against default config yields full admin takeover, so AV:N/AC:L/PR:N/UI:N and C:H/I:H/A:H; scope unchanged within WordPress.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Advanced Responsive Video Embedder for Rumble, Odysee, YouTube, Vimeo, Kick … plugin for WordPress is vulnerable to Authentication Bypass via a Hardcoded Backdoor in version 10.8.7. The vulnerability exists because the _arve_uc_init() function - registered on WordPress's init hook at priority 1 so that it runs before any authentication checks on every request - reads an attacker-supplied token from the _wplogin (or _wpm) parameter and compares it against a hardcoded SHA-256 hash embedded directly in the plugin source, with no nonce verification, no capability check, and no password validation anywhere in the flow. Because this static hash constitutes a set of universal credentials that are publicly accessible in the plugin's source code, unauthenticated attackers can supply the known token to be authenticated as an arbitrarily selected existing administrator account, gaining full administrative control over the affected WordPress site. This was likely introduced by an attacker who gained commit access to the developers account.
Articles & Coverage 1
AnalysisAI
Authentication bypass in the Advanced Responsive Video Embedder (ARVE) WordPress plugin version 10.8.7 lets unauthenticated attackers log in as any existing administrator by supplying a known hardcoded token. Because the token is a static SHA-256 hash embedded in the publicly readable plugin source, anyone can extract it and gain full administrative control of an affected site. Wordfence attributes this to a likely supply-chain compromise of the developer's account, and while no public exploit is identified at time of analysis, the EPSS score is modest (0.59%, 45th percentile) despite the maximal 9.8 CVSS.
Technical ContextAI
ARVE is a WordPress video-embed plugin (vendor slug nico23) for services like Rumble, Odysee, YouTube, Vimeo, and Kick, per CPE cpe:2.3:a:nico23:advanced_responsive_video_embedder_...:*. The flaw is a classic CWE-506 (Embedded Malicious Code / backdoor): the _arve_uc_init() function hooks WordPress's init action at priority 1, so it executes on every request before authentication or capability checks occur. It reads an attacker-controlled token from the _wplogin or _wpm request parameter and compares it to a SHA-256 hash hardcoded in fn-update-check.php. There is no nonce, no capability check, and no password validation - the static hash functions as universal credentials, and because it lives in cleartext source (viewable via plugins.trac.wordpress.org), the 'secret' is not secret at all.
RemediationAI
Because this is a malicious backdoor rather than an ordinary bug, immediately remove or roll back version 10.8.7 to the last known-clean release; the available data does not enumerate a specific fixed version, so treat this as 'No vendor-released patch identified at time of analysis' and consult the Wordfence advisory (https://www.wordfence.com/threat-intel/vulnerabilities/id/70f64ea0-5375-479f-90ac-29bcdf817cef) and WordPress.org plugin page for a clean release before reinstalling. Any site that ran 10.8.7 must be treated as compromised: audit for rogue administrator logins and unexpected admin account activity, force-reset all administrator credentials and secrets, and review the site for webshells or unauthorized changes. As an immediate compensating control while awaiting a clean version, deactivate and delete the plugin entirely (side effect: video embeds stop rendering), or use a WAF to block requests containing the _wplogin and _wpm parameters against init; note a WAF rule is only a stopgap since the backdoor code still resides on disk. Verify any replacement download against the vendor's clean source given the suspected developer-account compromise.
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Same weakness CWE-506 – Embedded Malicious Code
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today