CVE-2026-19807

8.8 HIGH

Published 2026-10-01 · Updated 2026-10-03

AI risk analysis

Summary: The ByteCoreStack – MCP Connector for AI Tools plugin allows authenticated attackers with Subscriber-level access to escalate their privileges to Administrator by exploiting a vulnerability in the `wp_update_user_meta` function.
Exploitability: Exploitation is relatively straightforward for attackers with Subscriber-level access, as the plugin does not adequately restrict writes to certain user meta keys.
Blast radius: If exploited, the attacker can gain full administrative control over the WordPress site, potentially leading to data loss, unauthorized content changes, or other severe consequences.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to version 1.2.4 or later, as the vulnerability was fixed in this version.

auth-bypasspriv-escalationwebwordpress

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-269

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

Related CVEs

Related by shared AI tags and CWE weakness class. Browse the full archive.