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Security audit

Sendbl

Security checks across malware telemetry and agentic risk

Overview

This is a straightforward Sendbl file-transfer skill, but users should treat its API key, owner tokens, and generated links as sensitive.

Install only if you are comfortable giving the assistant a Sendbl personal access token. Keep SENDBL_API_KEY, owner_token values, upload URLs, and download URLs private; review filenames, recipients, and deletion requests before approving actions; revoke or rotate tokens if exposed.

SkillSpector

By NVIDIA
Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (3)

External Transmission

Medium
Category
Data Exfiltration
Content
Requires the `owner_token` from step 1 (or 2).

```sh
curl -sS "https://api.sendbl.com/v1/uploadedFiles?token=<owner_token>&limit=50"
```

Returns the array of files with `file_id` and `filename`. To get a download URL for one of them:
Confidence
78% confidence
Finding
This endpoint places the sensitive owner_token directly in the URL query string, which can be exposed through shell history, process listings, proxy logs, browser/server logs, and telemetry systems. Because the owner_token authorizes listing uploaded files and is described as non-recoverable, leakage could let an unintended party enumerate shared files and pivot to file access operations.

External Transmission

Medium
Category
Data Exfiltration
Content
Returns the array of files with `file_id` and `filename`. To get a download URL for one of them:

```sh
curl -sS "https://api.sendbl.com/v1/fileDownloadLink?token=<owner_token>&file_id=<file_id>"
```

### 5. Delete a link
Confidence
81% confidence
Finding
This call also embeds the sensitive owner_token in the query string, and here it is used to retrieve a file download link. Leakage of the URL or logs containing it could allow an unauthorized party to generate download links for uploaded files, making this more dangerous than simple status or listing operations.

External Transmission

Medium
Category
Data Exfiltration
Content
Requires the `owner_token`. Removes the link **and all uploaded files**.

```sh
curl -sS -X DELETE "https://api.sendbl.com/v1/uploadLink?token=<owner_token>"
```

Confirm with the user before calling — this is irreversible.
Confidence
80% confidence
Finding
The delete operation includes the owner_token in the URL query string, exposing a bearer secret that authorizes irreversible deletion of the link and all uploaded files. If that token is logged or leaked, an attacker could destroy data or disrupt file exchange without further authentication.

VirusTotal

65/65 vendors flagged this skill as clean.

View on VirusTotal

Static analysis

No suspicious patterns detected.