postboi@0.67.0
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 22d ago · by lpm-firewall-aiThe package has a concrete, project-local agent configuration capability reached through explicit CLI commands, so a warning is appropriate. The inspected `prepare` hook only runs SvelteKit synchronization and does not establish install-time agent modification or credential exfiltration.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
A user invokes `postboi init`, `postboi skill`, or `postboi sync`.
Impact
Future coding-agent sessions in the project may follow the installed Postboi guidance. No install-time attack was established.
Mechanism
The CLI writes the bundled skill under `.claude/skills/postboi` or `.agents/skills/postboi`; setup can refresh an existing skill and append a pointer to an existing `AGENTS.md`.
AI rationale
The package has a concrete, project-local agent configuration capability reached through explicit CLI commands, so a warning is appropriate. The inspected `prepare` hook only runs SvelteKit synchronization and does not establish install-time agent modification or credential exfiltration.
Evidence
package.jsondist/cli.js.claude/skills/postboi/SKILL.md.agents/skills/postboi/SKILL.mdAGENTS.md
Decision evidence
public snapshotAI called this Suspicious at 84.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- The manifest exposes a CLI and its `prepare` hook runs SvelteKit synchronization.
- The CLI targets project-local Claude and Agents skill locations and `AGENTS.md`.
- Explicit `init` and `skill` commands reach skill setup; `init` asks before installing a missing skill.
- For an existing skill, setup refreshes it and may update companion files or append a pointer to `AGENTS.md`.
- The agent-file changes are reached through CLI setup, not the inspected npm lifecycle hook.
Evidence against
Behavioral surface
ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShell
HighEntropyStringsMinifiedUrlStrings
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@0.67.0.
See all versions of postboi for other recorded verdicts.
- Review the evidence and your use of postboi@0.67.0 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: .
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