SniffPup
REMOTE · SNIFFPUP.COM
Free passive outside security scan of a live web app: leaked keys, exposed files, open Supabase
Available components
Last scanned (22 hours ago)
Scores higher than 76% of remote servers
Reachable. Last reached 4 Nov 2026.
Category Security
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability78
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 216 tokens (~216/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management27
- Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 4 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.
- 3 Nov 26 +2
- The server rewrote its instructions, which are the text every model session reads security
- Schema quality: 307 → 216 ▲ functional
- Schema quality: good → excellent functional
- 2 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.
- 1 Nov 26 +1
- Tool “scan_site” rewrote its description, which is the text the model reads security
- Schema quality: 363 → 307 ▲ functional
- “scan_site” reworded the description of “consent” cosmetic
- 29 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 28 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 27 Oct 26 72
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Probed https://sniffpup.com/api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=sniffpup.com | CN=YR2,O=Let's Encrypt,C=US | 18 Oct 2026 | 16 Jan 2027 | RSA 2048 | SHA256-RSA | 54d0e979fb2de9e6b195010bf99cf3363d4 |
| SANs: sniffpup.com | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of sniffpup.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| sniffpup.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000; includeSubDomains; preload |
| content-security-policy | default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self' data:; connect-src 'self'; frame-src 'none'; frame-ancestors 'none'; object-src 'none'; base-uri 'self'; form-action 'self' https://checkout.stripe.com https://billing.stripe.com; upgrade-insecure-requests |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | camera=(), microphone=(), geolocation=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://sniffpup.com/api/mcp | Verified | 200 | |
| http (plaintext) | http://sniffpup.com/api/mcp | HTTPS enforced | 308 | https://sniffpup.com/api/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
scan_site Free scan of a site ~161
Runs SniffPup's free passive scan of a live website (takes up to about a minute) and returns the score and the issues found. Every critical issue comes with masked evidence, fix steps and a fix prompt (with no critical issue, one other issue does). Only scan a site the user owns or has permission to test, and set consent to true only after the user confirms: I own this site or can test it, and agree to the Terms, including individual arbitration.
| Name | Type | Req | Description |
|---|---|---|---|
| consent | boolean | yes | true only if the user confirmed: I own this site or can test it, and agree to the Terms, including individual arbitration. |
| url | string | yes | The live site to scan, like https://your-app.com or your-app.com. |
No output schema declared.
No examples provided.
How do I install the SniffPup MCP server?
SniffPup is a hosted endpoint at https://sniffpup.com/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · sniffpup.com
claude mcp add --transport http sniffpup-sniffpup 'https://sniffpup.com/api/mcp'
What is the SniffPup MCP server?
SniffPup is an MCP server listed in the public MCP registry as io.github.sniffpup/sniffpup. Free passive outside security scan of a live web app: leaked keys, exposed files, open Supabase. This page covers its hosted endpoint (https://sniffpup.com/api/mcp).
Is the SniffPup MCP server safe to use?
SniffPup scores 78 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the SniffPup MCP server expose?
SniffPup exposes 1 tool: scan_site. Their descriptions and schemas cost roughly 161 tokens of context every time the server is loaded.
Does the SniffPup MCP server require authentication?
No. We connected to SniffPup without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the SniffPup MCP server still maintained?
SniffPup is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.