Medium 5.1Published Oct 13, 2026

CVE-2026-53711MCP ContextForge: Global Prompts stored cross-site scripting compromises the Admin UI

Updated under an hour ago (2026-10-19 07:30 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.1 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 13, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

IBM mcp-context-forge ibm:mcp_context_forge (from the name)	from 0.2.0, < 0.3.1	CNA record

References

https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-x6gc-rm5j-55mwx-refsource-confirm
https://github.com/IBM/mcp-context-forge/pull/337x-refsource-misc
https://github.com/IBM/mcp-context-forge/commit/acd16196158f9a393187551b21a2fc61650f2e3dx-refsource-misc
https://github.com/IBM/mcp-context-forge/releases/tag/v0.3.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.