MCP, MCP server
CanvasMCPClient
CanvasMCPClient, an MCP server listed in the PlugVet directory.
Compatibility: Not stated.
Grade D
Two or more Medium findings, or a High finding. Only try it in a sandbox.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
Rescanned at commit 60e91d4afff0, unchanged since the check below.
PERMISSION_SHELL_UNDECLARED INSTALL_REMOTE_SCRIPT NETWORK_HOST_FROM_INPUT
Why this grade
- PERMISSION_SHELL_UNDECLARED Medium
Runs shell commands that the manifest or description does not mention.
backend/migrations.py, line 23
result = subprocess.run( - INSTALL_REMOTE_SCRIPT Medium
Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).
package.json, line 7
prepare - NETWORK_HOST_FROM_INPUT Medium
A file takes a URL or endpoint as input and has no fixed host list.
backend/routers/webpage.py, line 142
response = requests.get(url, headers=headers, timeout=10, allow_redirects=True)
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.
If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.
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
requests shell access. No manifest field names shell or command execution.
PERMISSION_SHELL_UNDECLARED
backend/migrations.py, line 23
result = subprocess.run(
backend/migrations.py, line 50
result = subprocess.run(
backend/migrations.py, line 76
result = subprocess.run(cmd, cwd=backend_dir, capture_output=True, text=True, check=True)
Show more
backend/run_tests.py, line 16
result = subprocess.run(cmd, cwd=cwd, env=env, capture_output=False)
backend/routers/mcp_directory.py, line 300
github_result = subprocess.run(
backend/routers/mcp_directory.py, line 316
anthropic_result = subprocess.run(
backend/scripts/reset_database.py, line 78
result = subprocess.run(["alembic", "stamp", "head"], cwd=backend_dir, capture_output=True, text=True)
backend/scripts/reset_database.py, line 84
result = subprocess.run(["alembic", "upgrade", "head"], cwd=backend_dir, capture_output=True, text=True)
Install and update
Serious
install fetches a script from the network.
INSTALL_REMOTE_SCRIPT
package.json, line 7
prepare
backend/Dockerfile, line 12
RUN curl -LsSf https://astral.sh/uv/install.sh | sh
Network
Serious
accepts a host from input, with no fixed list in this file.
NETWORK_HOST_FROM_INPUT
backend/routers/webpage.py, line 142
response = requests.get(url, headers=headers, timeout=10, allow_redirects=True)
backend/routers/webpage.py, line 250
response = requests.head(url, headers=headers, timeout=5, allow_redirects=True)
backend/routers/widget_connections.py, line 115
response = requests.get(url, headers=headers, timeout=10, allow_redirects=True)
Show more
frontend/src/components/Modals/WidgetLibraryModal.tsx, line 307
const response = await fetch(`${apiUrl}/api/widget-blueprints/?${params}`);
frontend/src/components/Panels/ConnectionPanel.tsx, line 72
const response = await fetch(`${apiUrl}/api/widget-blueprints/?${params}`);
frontend/src/components/Panels/WidgetLibraryPanel.tsx, line 302
const response = await fetch(`${apiUrl}/api/widget-blueprints/?${params}`);
frontend/src/components/Toolbar/Toolbar.tsx, line 62
const response = await fetch(`${apiUrl}/api/widget-blueprints/?public_only=true`);
frontend/src/components/Widgets/WidgetRenderer.tsx, line 446
const aiConfigResponse = await fetch('http://localhost:8081/api/ai-configs/default/current');
frontend/src/components/Widgets/WidgetRenderer.tsx, line 463
const response = await fetch(`http://localhost:8081${endpoint}`, {
frontend/src/components/Widgets/UniversalWidgetEngine/hooks/useDataSource.ts, line 63
const response = await fetch(dataSource.endpoint, {
frontend/src/hooks/useWidgetCreation.ts, line 257
await fetch(`${apiUrl}/api/widget-blueprints/${blueprint.id}/install`, {
frontend/src/services/api.ts, line 477
const response = await fetch(`${api.defaults.baseURL}/ai/chat/stream`, {
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_DOTENV
backend/scripts/scrape_awesome_mcp_servers.py, line 74
self.github_token = os.getenv("GITHUB_TOKEN")
backend/services/encryption_service.py, line 24
key_string = os.getenv("ENCRYPTION_KEY")
backend/services/encryption_service.py, line 30
password = os.getenv("SECRET_KEY", "canvas-mcp-client-default-secret")
Show more
.env.example, line 2
# Copy this file to .env and customize as needed for your environment
.gitignore, line 47
# dotenv environment variables file
.gitignore, line 48
.env
.gitignore, line 49
.env.local
.gitignore, line 50
.env.development.local
.gitignore, line 51
.env.test.local
.gitignore, line 148
# dotenv environment variable files
.gitignore, line 149
.env
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
frontend/package-lock.json, line 1
{
frontend/tsconfig.tsbuildinfo, line 1
{"fileNames":["./node_modules/typescript/lib/lib.es5.d.ts","./node_modules/typescript/lib/lib.es2015.d.ts","./node_modules/typescript/lib/lib.es2016.d.ts","./node_modules/typescrip
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit 60e91d4afff0. requests shell access. No manifest field names shell or command execution. install fetches a script from the network. accepts a host from input, with no fixed list in this file. reads a credential or environment file. a file was over the read cap and was not fully read.
Date and source
Date checked:
github.com
Commit graded: 60e91d4afff043beac9e4bc133671ad2db765b5f
This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.