CVE-2026-53711CWE-79cross-site-scripting

CVE-2026-53711

published October 13, 2026

CVSS
5.1
EPSS
0%
Percentile
28.9
In the wild
Unconfirmed
What it is

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 record
Technical detail
CVSS
5.1 · NONE
CVSS v4.0
5.1 · 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
EPSS
0.00363 · 28.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-13T19:17Z
References (5)
https://github.com/IBM/mcp-context-forge/commit/acd16196158f9a393187551b21a2fc61650f2e3d · [email protected]https://github.com/IBM/mcp-context-forge/pull/337 · [email protected]https://github.com/IBM/mcp-context-forge/releases/tag/v0.3.1 · [email protected]https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-x6gc-rm5j-55mw · [email protected]https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-x6gc-rm5j-55mw · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 15 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 13 OCT 14:34Z
    MCP ContextForge: Global Prompts stored cross-site scripting compromises the Admin UI
    cvelistv5
  • 13 OCT 14:34Z
    MCP ContextForge: Global Prompts stored cross-site scripting compromises the Admin UI
    cvelistv5