postboi@0.53.1
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 1mo ago · by lpm-firewall-aiThe package has a concrete project agent-configuration capability, so it merits a warning under the agent integration policy. It is user-triggered or confirmation-gated and no malicious installation-time behavior was found.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
A user confirms the prompt during initialization or explicitly runs the skill command.
Impact
This can influence supported coding agents in that project, but source inspection found no automatic lifecycle activation.
Mechanism
The CLI installs or links a Postboi skill and may append a pointer to an existing AGENTS.md file.
AI rationale
The package has a concrete project agent-configuration capability, so it merits a warning under the agent integration policy. It is user-triggered or confirmation-gated and no malicious installation-time behavior was found.
Evidence
dist/cli.js.claude/skills/postboi/SKILL.md.agents/skills/postboi/SKILL.mdAGENTS.md
Decision evidence
public snapshotAI called this Suspicious at 90.0% confidence as Dangerous Capability with low false-positive risk.
Evidence for warning
- The manifest has no install or postinstall hook; its prepare script performs a framework sync.
- The CLI offers installation of its agent skill only after an interactive confirmation during initialization.
- The explicit skill command can create an agent-skill link and append a Postboi pointer to an existing project AGENTS.md file.
Evidence against
- The agent integration modifies project-level AI-agent guidance files and can link them to the installed package.
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 (;; ) {
...
L270: if (this.#hooks.before?.send) {
L271: return this.#hooks.before.send({
L272: provider: this.provider,
...
L319: async send_request(url, init) {
L320: return fetch(url, init);
L321: }
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 (;; ) {
...
L270: if (this.#hooks.before?.send) {
L271: return this.#hooks.before.send({
L272: provider: this.provider,
...
L319: async send_request(url, init) {
L320: return fetch(url, init);
L321: }
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@0.54.3
matchedIdentity = npm:cG9zdGJvaQ:0.54.3
similarity = 0.975
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@0.53.1.
See all versions of postboi for other recorded verdicts.
- Review the evidence and your use of postboi@0.53.1 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.