XSS in MCP Context Forge 0.2.00.3.1 Global Prompts unsanitized in Admin UI
CVE-2026-53711 Published on October 13, 2026

MCP ContextForge: Global Prompts stored cross-site scripting compromises the Admin UI
MCP Context Forge provides an MCP Admin UI for managing gateway resources. From 0.2.0 until 0.3.1, the Global Prompts feature stores a prompt template without sufficient output encoding before the MCP Admin UI renders it. An authenticated attacker can save markup containing script-capable event handlers, and the code executes when another user views the saved prompt. The stored cross-site scripting can alter the interface, present phishing content, observe keystrokes available to the page, and act with the viewer's browser session. This issue is fixed in version 0.3.1.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-53711 can be exploited with network access. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-53711. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
PASSIVE

Weakness Type

What is a XSS Vulnerability?

The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

CVE-2026-53711 has been classified to as a XSS vulnerability or weakness.


Affected Versions

IBM mcp-context-forge Version >= 0.2.0, < 0.3.1 is affected by CVE-2026-53711