CVE-2026-53711Medium· 5.1▾ TwilightPoC available

MCP Context Forge provides an MCP Admin UI for managing gateway resources

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score40/ 100 · Moderate

impact 28.1 · likelihood 0.1 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

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Published

Oct 13, 2026

Updated

Oct 16, 2026

CVSS

5.1

Vendor

IBM

Product

mcp-context-forge

CWE

CWE-79

Depth score

40 · Moderate

EPSS

0.36% · p30

Platforms

—

Source

NVD

Vector

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

CISA SSVC

decided 2026-10-13

Exploitation: poc
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 15.

0.4% → 0.4%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

6 events · 3 days

Oct 13, 2026Published
Disclosed via NVD
Oct 15, 2026EPSS first tracked
0.4%
Oct 15, 2026Public exploit observed
Exploit / PoC code exists
Oct 15, 2026CVSS changed
— → 5.1
Oct 15, 2026Severity changed
none → medium
Oct 16, 2026Record revised
Last analysed / modified upstream

IBM CWE-79 #nvd #cve.org #exploit-available

Affected

mcp-context-forge >= 0.2.0, < 0.3.1

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Oct 15, 2026Public exploit / PoC published
Oct 15, 2026CVSS — → 5.1
Oct 15, 2026Severity none → medium

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available

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