IBM mcp-context-forge up to 0.3.0 Global Prompts cross site scripting

Summaryinfo

A vulnerability was found in IBM mcp-context-forge up to 0.3.0 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component Global Prompts. Executing a manipulation can lead to cross site scripting. This vulnerability is handled as CVE-2026-53711. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in IBM mcp-context-forge up to 0.3.0. This vulnerability affects an unknown code of the component Global Prompts. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product 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. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-53711 since 06/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/13/2026). The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 0.3.1 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• IBM

Name

• mcp-context-forge

Version

• 0.1
• 0.2
• 0.3.0

License

• commercial

Website

• Vendor: https://www.ibm.com/
• Product: https://github.com/IBM/mcp-context-forge/

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