ByteCoreStack <= 1.2.3 - Authenticated (Subscriber+) Privilege Escalation via wp_update_user_meta MCP Tool
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.
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| Platforma | Paczka | Podatne wersje | Poprawka w wersji |
|---|---|---|---|
| Wtyczka WordPress | ByteCoreStack – MCP Connector for AI Tools | <= 1.2.3 | 1.2.4 |
Odnośniki
- Wektor CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Słabość (CWE)
CWE-269- Platforma
- WordPress
- Paczka
ByteCoreStack – MCP Connector for AI Tools- Ujawniono
- 30.09.2026
- Aktualizacja
- 11.10.2026 10:23
Źródła i licencje
Wordfence Intelligence - ac09bf3e-49cf-4f11-92ba-d1fbf6f587d7 - Wordfence Intelligence
Copyright 1999-2026 The MITRE Corporation
Copyright 2012-2026 Defiant Inc.
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Wordfence Intelligence - Defiant, Inc. Copyright Defiant, Inc. All rights reserved except as granted below. License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026): Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy. Full applicable Agreement: https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/
Historia podatności: ByteCoreStack – MCP Connector for AI Tools
Wszystkie opisane podatności tej paczki (Wtyczka WordPress), od najnowszej. Widać, czy to jednorazowa wpadka, czy paczka, której trzeba pilnować.
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- 09.2026 10.2026
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Rozkład istotności
- Wysoka 1
- Średnia 1
Ujawnienia w latach
- 2026: 2
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