postboi@0.68.0
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 install hook is limited to Svelte synchronization, and the flagged credential and browser patterns did not establish exfiltration. The CLI does modify agent guidance during explicit setup, including refreshing an existing skill, so this warrants a warning under the agent capability policy.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
A user runs `postboi init`; an existing skill is refreshed automatically during that command, while installing a missing skill asks for confirmation.
Impact
This changes agent guidance files in the project; the inspected source does not show a broader control-surface mutation or an install-time trigger for these writes.
Mechanism
The CLI writes the package-owned skill to `.claude/skills/postboi/SKILL.md` or `.agents/skills/postboi/SKILL.md` and may add a Postboi pointer to `AGENTS.md`.
AI rationale
The install hook is limited to Svelte synchronization, and the flagged credential and browser patterns did not establish exfiltration. The CLI does modify agent guidance during explicit setup, including refreshing an existing skill, so this warrants a warning under the agent capability policy.
Evidence
.claude/skills/postboi/SKILL.md.agents/skills/postboi/SKILL.mdAGENTS.md
Decision evidence
public snapshotAI called this Suspicious at 89.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- The prepare hook runs `svelte-kit sync`; the CLI is separately exposed as a command.
- The CLI defines Postboi skill files under `.claude/skills/postboi` and `.agents/skills/postboi`, with an `AGENTS.md` pointer.
- Running `postboi init` invokes skill setup. If the skill already exists, setup refreshes it; if it is absent, installation requires confirmation.
Evidence against
- Credential synchronization filters out `POSTBOI_` variables and sends remaining values through the Postboi account flow; the inspected source did not establish credential theft.
- The flagged browser and child-process references include opening URLs for user-facing setup; the inspected source did not establish browser credential collection or command-output exfiltration.
Behavioral surface
ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShell
HighEntropyStrings
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@0.68.0.
See all versions of postboi for other recorded verdicts.
- Review the evidence and your use of postboi@0.68.0 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.