MCP, MCP server
Outlook Mcp
MCP server for Claude to access Outlook data via Microsoft Graph API
Compatibility: Not stated.
Grade B
Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
Rescanned at commit 95d6ff2d2489, unchanged since the check below.
PERMISSION_DELETE_FILES NETWORK_NO_FIXED_HOST SECRETS_PATH_DOTENV SECRETS_ENV_READ OBFUSCATION_FILE_OVER_READ_CAP
Why this grade
- PERMISSION_DELETE_FILES Low
Contains a call that can delete files.
auth/token-storage.js, line 271
await fs.unlink(this.config.tokenStorePath); - NETWORK_NO_FIXED_HOST Low
Makes a network call whose host is not written as a fixed address.
create-notifications-rule.js, line 123
const req = https.request(options, (res) => { - SECRETS_PATH_DOTENV Low
Mentions a .env file.
outlook-auth-server.js, line 10
// Load environment variables from .env file - SECRETS_ENV_READ Note
Reads an environment variable whose name contains KEY, SECRET, TOKEN, PASSWORD or CREDENTIAL.
config.js, line 21
clientSecret: process.env.OUTLOOK_CLIENT_SECRET || '', - OBFUSCATION_FILE_OVER_READ_CAP Note
A file was over the read cap and was not fully read.
package-lock.json, line 1
{
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Concern
can delete files.
PERMISSION_DELETE_FILES
auth/token-storage.js, line 271
await fs.unlink(this.config.tokenStorePath);
Install and update
Pass
No install-time script found, and dependencies are pinned or absent.
Network
Concern
can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST
create-notifications-rule.js, line 123
const req = https.request(options, (res) => {
find-folder-ids.js, line 107
const req = https.request(options, (res) => {
move-github-emails.js, line 131
const req = https.request(options, (res) => {
Show more
outlook-auth-server.js, line 288
const req = https.request(options, (res) => {
auth/token-storage.js, line 149
const req = https.request(this.config.tokenEndpoint, requestOptions, (res) => {
auth/token-storage.js, line 223
const req = https.request(this.config.tokenEndpoint, requestOptions, (res) => {
onedrive/upload-large.js, line 142
const req = https.request(uploadUrl, options, (res) => {
power-automate/flow-api.js, line 40
const req = https.request(options, (res) => {
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_DOTENV
config.js, line 21
clientSecret: process.env.OUTLOOK_CLIENT_SECRET || '',
outlook-auth-server.js, line 10
// Load environment variables from .env file
outlook-auth-server.js, line 42
clientSecret: process.env.MS_CLIENT_SECRET || '', // Set your client secret as an environment variable
Show more
auth/token-storage.js, line 11
// Support both MS_CLIENT_ID (auth server / .env) and OUTLOOK_CLIENT_ID (Claude Desktop config)
auth/token-storage.js, line 13
const clientSecret = process.env.MS_CLIENT_SECRET || process.env.OUTLOOK_CLIENT_SECRET;
auth/token-storage.js, line 22
tokenEndpoint: process.env.MS_TOKEN_ENDPOINT || `${authorityHost}/${tenantId}/oauth2/v2.0/token`,
.gitignore, line 7
# Environment variables
.gitignore, line 8
.env
.gitignore, line 9
.env.local
.gitignore, line 10
.env.development.local
.gitignore, line 11
.env.test.local
CLAUDE.md, line 67
- **For .env file**: Use `MS_CLIENT_ID` and `MS_CLIENT_SECRET`
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Note
a file was over the read cap and was not fully read.
OBFUSCATION_FILE_OVER_READ_CAP
package-lock.json, line 1
{
Licence
Note
no licence file found.
LICENCE_MISSING
No file path was stored.
no licence file found.
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit 95d6ff2d2489. can delete files. can reach a host that is not written as a fixed address. reads a credential or environment file. a file was over the read cap and was not fully read. no licence file found.
Date and source
Date checked:
github.com
Commit graded: 95d6ff2d248903c086f17782c2de28e16016e6aa
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