EUVD-2026-90548
GHSA-qwvr-5fhh-47xh
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable MCP endpoint (AV:N), deterministic single-request logic (AC:L), requires a low-privilege authenticated account (PR:L), no interaction; self-escalation to admin grants full C/I/A.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
3DescriptionCVE.org
The ByteCoreStack - MCP Connector for AI Tools plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.2.3 This is due to the wp_update_user_meta MCP tool in execute_tool gating writes solely with current_user_can('edit_user', $uid) - a check that WordPress core's map_meta_cap resolves to the read primitive when the target user ID matches the caller's own - while enforcing an incomplete meta key blocklist that covers only user_pass, user_activation_key, and session_tokens, leaving the wp_capabilities and wp_user_level meta keys entirely unprotected. This makes it possible for authenticated attackers with Subscriber-level access and above to elevate their privileges to Administrator by issuing a wp_update_user_meta call over the MCP JSON-RPC endpoint with key=wp_capabilities and an arbitrary role array such as {'administrator': true} targeting their own user ID, causing WordPress to load that account as an Administrator on the next request.
AnalysisAI
Authenticated attackers holding Subscriber-level (or higher) WordPress accounts can escalate themselves to Administrator on any site running the ByteCoreStack - MCP Connector for AI Tools plugin through version 1.2.3, because the plugin's wp_update_user_meta MCP tool protects only user_pass, user_activation_key, and session_tokens while leaving wp_capabilities and wp_user_level writable. A single JSON-RPC call to the plugin's OAuth-gated MCP endpoint, targeting the attacker's own user ID with key=wp_capabilities and a role array such as {"administrator": true}, changes the account's role on the next request; no user interaction is required and the CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (8.8). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires: (1) the ByteCoreStack MCP Connector for AI Tools plugin active at version <=1.2.3; (2) an authenticated account at Subscriber level or above (PR:L); (3) network access to the plugin's MCP JSON-RPC endpoint, which is OAuth-gated (OAuth/Server.php L122). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely high-priority flaw where the CVSS 8.8 is well-earned by the mechanics, not inflated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: 1.2.4. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all WordPress installations for the ByteCoreStack - MCP Connector for AI Tools plugin at version 1.2.3 or earlier and, where the plugin is not business-critical, deactivate and remove it entirely; simultaneously disable open user self-registration on every affected site so that no new Subscriber-level accounts can be created, and audit existing Subscriber-and-above accounts for unexpected role changes. …
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External POC / Exploit Code
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