gcdRadar
archive/Patch now/AIR-2026-0129
closedclosed 15 Sep 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-58201: Lokka Microsoft 365 MCP server bearer token leak

Lokka

A path concatenation flaw in the Lokka Model Context Protocol server lets specially crafted paths redirect Azure bearer tokens to unintended hosts. The issue is fixed in version 2.1.2.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
8.7
EPSS
<0.01 · top 58% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
15 Sep 2026
last update
15 Sep 2026
CVE ids
CVE-2026-58201other records

Timeline · 1

  1. 15 Sep 2026CVE-2026-58201: Lokka is a Model Context Protocol server for Microsoft 365, including Microsoft Graph and other services.

Sources · 1

Advisories and databases

  1. 2026-09-15
    CVE-2026-58201: Lokka is a Model Context Protocol server for Microsoft 365, including Microsoft Graph and other services.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-58201

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling, Microsoft
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
mcptoken-leak
dates
happened 15 Sep 2026 · first reported 15 Sep 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 06:33Z · updated 2026-10-18 06:33Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-58201: Lokka Microsoft 365 MCP server bearer token leak

https://gcdradar.vercel.app/incidents/cve-2026-58201-lokka-microsoft-365-mcp-server-bearer-token-l · AIR-2026-0129 · closed 2026-09-15

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-15
- AI role: Attack on AI
- Products: Lokka
- CVE ids: CVE-2026-58201
- CVSS: 8.7

## Summary

A path concatenation flaw in the Lokka Model Context Protocol server lets specially crafted paths redirect Azure bearer tokens to unintended hosts. The issue is fixed in version 2.1.2.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-09-15: CVE-2026-58201: Lokka is a Model Context Protocol server for Microsoft 365, including Microsoft Graph and other services. (https://nvd.nist.gov/vuln/detail/CVE-2026-58201)

## Sources

- 2026-09-15 NVD: CVE-2026-58201: Lokka is a Model Context Protocol server for Microsoft 365, including Microsoft Graph and other services. https://nvd.nist.gov/vuln/detail/CVE-2026-58201

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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