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CVE-2026-19807 high CVSS 8.8

Privilege Escalation in ByteCoreStack – MCP Connector for AI Tools (WordPress plugin) (CVE-2026-19807)

Summary

Vulnerability in ByteCoreStack – MCP Connector for AI Tools (WordPress plugin) (CVE-2026-19807). Successful exploitation can lead to full system takeover. Exploitable via wp_update_user_meta.

Original description

The description as published by the source.

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.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-19807 has been found in ByteCoreStack – MCP Connector for AI Tools (WordPress plugin).
Attackers can target a specific entry point like wp_update_user_meta over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "ByteCoreStack – MCP Connector for AI Tools (WordPress plugin) CVE-2026-19807" on the vendor's site.

CVE-2026-19807 (ByteCoreStack – MCP Connector for AI Tools (WordPress plugin)) — CWE-269 / CVSS v3 8.8
Attack vector: remote (network-reachable) / no user interaction
Attack surface: wp_update_user_meta / execute_tool / map_meta_cap / read
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-269) exists in ByteCoreStack – MCP Connector for AI Tools (WordPress plugin). Attackers reach the vulnerable code path via wp_update_user_meta.

📍 Affected scope

Check the vendor advisory for the affected versions of ByteCoreStack – MCP Connector for AI Tools (WordPress plugin). Attack surface: wp_update_user_meta / execute_tool / map_meta_cap / read.

🔥 Severity

Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで ByteCoreStack – MCP Connector for AI Tools (WordPress plugin) を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

References

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