CVE-2026-53711

Description

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.

References

• https://github.com/IBM/mcp-context-forge/commit/acd16196158f9a393187551b21a2fc61650f2e3d
• https://github.com/IBM/mcp-context-forge/pull/337
• https://github.com/IBM/mcp-context-forge/releases/tag/v0.3.1
• https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-x6gc-rm5j-55mw
• https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-x6gc-rm5j-55mw