postboi@0.66.0
Postboi is an email provider and TypeScript SDK. Send email with one token and no DNS setup, plus SMS, WhatsApp, push and chat from the same API. You can also use your own provider (Resend, SES, Postmark and more) if you want to.
AI Security Review
scanned 27d ago · by lpm-firewall-aiThe inspected credential and network code supports Postboi service operations, while the scanner hints do not prove harvesting or exfiltration. The CLI’s agent-skill writes are a real package-owned integration capability reached through user commands, so a warning is appropriate without evidence of an active attack.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
Running the `postboi skill` or `postboi sync` command; `postboi init --agent` can also offer skill setup.
Impact
Project agent instructions may be changed to include Postboi guidance, and the skill can follow the installed package on future releases.
Mechanism
The CLI installs or refreshes its bundled skill and may append a Postboi pointer to an existing `AGENTS.md`. Initial setup is prompted when the target skill is absent; an existing skill can be refreshed without another prompt.
AI rationale
The inspected credential and network code supports Postboi service operations, while the scanner hints do not prove harvesting or exfiltration. The CLI’s agent-skill writes are a real package-owned integration capability reached through user commands, so a warning is appropriate without evidence of an active attack.
Evidence
dist/cli.js
Decision evidence
public snapshotAI called this Suspicious at 87.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- The `prepare` hook runs `svelte-kit sync`; the manifest does not define an install or postinstall hook.
- The CLI targets package-owned skill files under `.claude/skills/postboi` and `.agents/skills/postboi`.
- The explicit `skill` command installs or refreshes the bundled skill; `sync` also calls the refresh function.
- When refreshing an existing skill, the CLI can rewrite it and append a Postboi pointer to an existing `AGENTS.md`.
- The token-bearing request code inspected uses a Postboi token with the Postboi service client; no unrelated credential recipient was identified.
- `dist/views.js` begins with imports for its view and encoding modules; no suspicious behavior was identified there.
Evidence against
- No source evidence inspected established browser credential harvesting, shell-output exfiltration, or another active attack; the scanner labels alone do not establish those behaviors.
Behavioral surface
ChildProcessCryptoDynamicRequireEnvironmentVars
Source & flagged code
7 flaggeddist/cli.jsView file
41// src/library/encoding.ts
L42: function base64_decode(value) {
L43: const binary = atob(value);
...
L125: const { pathToFileURL } = await import("node:url");
L126: let dir = process.cwd();
L127: for (;; ) {
...
L277: if (this.#hooks.before?.send) {
L278: return this.#hooks.before.send({
L279: provider: this.provider,
...
L326: async send_request(url, init) {
L327: return fetch(url, init);
L328: }
Critical
Credential Exfiltration
Source appears to send environment or credential material to an external endpoint.
dist/cli.jsView on unpkg · L4141// src/library/encoding.ts
L42: function base64_decode(value) {
L43: const binary = atob(value);
...
L125: const { pathToFileURL } = await import("node:url");
L126: let dir = process.cwd();
L127: for (;; ) {
...
L277: if (this.#hooks.before?.send) {
L278: return this.#hooks.before.send({
L279: provider: this.provider,
...
L326: async send_request(url, init) {
L327: return fetch(url, init);
L328: }
Critical
Browser Credential Phishing
Source appears to collect browser login credentials for exfiltration.
dist/cli.jsView on unpkg · L41814} from "node:fs";
L815: import { spawnSync } from "node:child_process";
L816: import { join as join12, delimiter, dirname as dirname7 } from "node:path";
Findings
3 Critical3 High4 Medium5 Low
CriticalCredential Exfiltrationdist/cli.js
CriticalBrowser Credential Phishingdist/cli.js
CriticalPrevious Version Dangerous Deltadist/views.js
HighChild Processdist/cli.js
HighShelldist/cli.js
HighCommand Output Exfiltrationdist/cli.js
MediumDynamic Requiredist/workers_env.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowNon Install Lifecycle Scripts
LowScripts Present
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to postboi@0.66.0.
See all versions of postboi for other recorded verdicts.
- Review the evidence and your use of postboi@0.66.0 before allowing it. Restrict the permissions described in this report.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
Evidence last updated: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.