EUVD-2026-47907
GHSA-8g44-6rrm-mf2w
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network chain (PR:N/UI:N/AC:L) yields an admin-bound token granting full read/write over all site data, so C/I/A all High.
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
The MountDev AI MCP Connector for WordPress plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.6.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to obtain an administrator-bound OAuth Bearer token via a self-registered client, granting full administrator-equivalent access to the plugin's MCP tool surface and all exposed WordPress content, users, and options. This is exploitable by combining the publicly accessible Dynamic Client Registration endpoint, which allows unauthenticated callers to register arbitrary OAuth clients with an attacker-controlled redirect_uri, with the unprotected authorization endpoint to complete the full OAuth flow without any administrator interaction.
Articles & Coverage 1
AnalysisAI
Authorization bypass in the MountDev AI MCP Connector for WordPress plugin (all versions ≤ 1.6.1) lets unauthenticated attackers mint an administrator-bound OAuth Bearer token by abusing an open Dynamic Client Registration endpoint together with an unprotected authorization endpoint, yielding full admin-equivalent control over the plugin's MCP tool surface and all exposed WordPress content, users, and options. Because the flaw is network-reachable with no privileges or user interaction (CVSS 9.8), it effectively grants site takeover. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target WordPress site must have the MountDev AI MCP Connector plugin (≤ 1.6.1) installed and active with its OAuth/MCP endpoints reachable over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | All signals point to a genuine high priority for exposed instances. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker locates a WordPress site running the MountDev AI MCP Connector, sends an unauthenticated request to the Dynamic Client Registration endpoint to register a new OAuth client with a redirect_uri they control, then drives the unprotected authorization endpoint to complete the OAuth flow and receive an administrator-bound Bearer token - all without any administrator being logged in or clicking anything. Using that token against the MCP tool surface, they read and modify all posts, users, and site options, effectively taking over the site. … |
| Remediation | Upgrade the MountDev AI MCP Connector plugin to a version later than 1.6.1 (the fix is reflected in the WordPress.org trac changeset referenced above; an exact patched release version is not stated in the input, so confirm the fixed version on the plugin's WordPress.org page before deploying - Upstream fix available per the trac changeset, released patched version not independently confirmed here). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: audit all WordPress installations to identify instances of MountDev AI MCP Connector version 1.6.1 or earlier, then immediately disable or remove the plugin from all affected sites; simultaneously review WordPress admin access logs for signs of unauthorized administrative activity and anomalous OAuth token generation dating back 30 days. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today