postboi@0.64.0
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 package's prepare hook only runs Svelte synchronization. The inspected agent configuration behavior belongs to explicit CLI setup, and its installation prompt requires user confirmation; scanner hints alone do not establish an attack.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
A user runs the skill command or chooses to install the skill during CLI setup.
Impact
No confirmed malicious impact or credential exfiltration was established from the inspected paths.
Mechanism
The CLI writes its bundled Postboi skill into project-local agent directories; the install prompt requires confirmation.
AI rationale
The package's prepare hook only runs Svelte synchronization. The inspected agent configuration behavior belongs to explicit CLI setup, and its installation prompt requires user confirmation; scanner hints alone do not establish an attack.
Evidence
.claude/skills/postboi/SKILL.md.agents/skills/postboi/SKILL.mdAGENTS.md
Decision evidence
public snapshotAI called this Clean at 91.0% confidence as Benign with low false-positive risk.
Evidence for AI clean decision
- package.json limits the prepare hook to Svelte synchronization.
- dist/cli.js stores Postboi skill paths under project-local .claude and .agents directories.
- The skill installation prompt requires confirmation, and the skill command is explicitly dispatched by the CLI.
Evidence against
Behavioral surface
ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShell
HighEntropyStringsMinifiedUrlStrings
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 · L41•matchType = previous_version_dangerous_delta
matchedPackage = postboi@0.60.0
matchedIdentity = npm:cG9zdGJvaQ:0.60.0
similarity = 0.842
summary = stored previous version shares package body but lacks this dangerous source file
Findings
3 Critical3 High4 Medium5 Low
CriticalCredential Exfiltrationdist/cli.js
CriticalBrowser Credential Phishingdist/cli.js
CriticalPrevious Version Dangerous Deltadist/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@0.64.0.
See all versions of postboi for other recorded verdicts.
- Review the evidence and your use of postboi@0.64.0 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.