postboi@0.68.1
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 23d ago · by lpm-firewall-aiThe CLI has a concrete agent-configuration capability that runs through an explicit user command, so a warning is appropriate. The credential-related source instead shows Turnstile verification, and the manifest’s prepare command is Svelte synchronization.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
A user invokes the postboi skill command.
Impact
Project agent guidance can be added or updated, influencing how coding agents handle the project’s email-related work.
Mechanism
The command installs or refreshes skill files and may append a Postboi pointer to an existing AGENTS.md file.
AI rationale
The CLI has a concrete agent-configuration capability that runs through an explicit user command, so a warning is appropriate. The credential-related source instead shows Turnstile verification, and the manifest’s prepare command is Svelte synchronization.
Evidence
dist/cli.js.claude/skills/postboi/SKILL.md.agents/skills/postboi/SKILL.mdAGENTS.md
Decision evidence
public snapshotAI called this Suspicious at 91.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- package.json defines prepare as a Svelte sync command; the agent-file setup is exposed through the CLI.
- The CLI maps the explicit skill command to the skill setup function.
- The skill setup targets project agent skill files and may add a Postboi section to AGENTS.md.
- When AGENTS.md exists and lacks a Postboi reference, the helper appends a pointer to the skill.
- The inspected credential path verifies a Turnstile token and forwards it to the verification flow.
Evidence against
- The inspected CLI route requires an explicit skill command; the manifest does not assign agent-file setup to its prepare script.
- The credential-related excerpts show captcha verification, not credential harvesting or disclosure.
Behavioral surface
ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShell
HighEntropyStringsMinified
Source & flagged code
6 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
2 Critical3 High4 Medium5 Low
CriticalCredential Exfiltrationdist/cli.js
CriticalBrowser Credential Phishingdist/cli.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@0.68.1.
See all versions of postboi for other recorded verdicts.
- Review the evidence and your use of postboi@0.68.1 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: .
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