registry / @cxtms/cx-schema / 1.9.250

@cxtms/cx-schema@1.9.250

Schema validation package for CXTMS YAML modules

AI Security Review

scanned 26d ago · by lpm-firewall-ai

LPM treats this as warn-only first-party agent extension lifecycle risk. The install lifecycle contains a guarded, package-owned Claude skill installer. If its guard is bypassed or absent, it writes bundled skills into the consumer project's Claude skill directory and removes several named legacy CXTMS skills.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

npm postinstall in an environment where npm_package_name is absent or differs; the CLI update command can also reinstall skills after a user runs it.

Impact

It can alter the consuming project's AI-agent skill set, but the source limits this to CXTMS-named skills and does not show exfiltration or remote payload execution.

Mechanism

Project-local Claude skill installation and replacement.

AI rationale

The package carries an AI-agent control-surface mutation path, but it is vendor-scoped and normally guarded out of its own lifecycle. The remaining update behavior is user-CLI-triggered, so the source does not establish malicious intent or a publish-block chain.

Evidence

package.jsonscripts/postinstall.jsdist/cli.js.claude/skills/cxtms-developer.claude/skills/cxtms-module-builder.claude/skills/cxtms-workflow-builder.claude/skills/cx-build.claude/skills/cx-core.claude/skills/cx-module.claude/skills/cx-workflow.cx-schema/validate.js

Decision evidence

public snapshot

AI called this Suspicious at 88.0% confidence as Dangerous Capability with low false-positive risk.

Evidence for warning

The declared postinstall script installs package-supplied Claude skills into the consuming project's .claude directory.
The postinstall script recursively deletes named existing skill directories before copying replacements.
The command-line update path runs npm install for a different package name and then updates Claude instructions.

Evidence against

The postinstall guard skips main when npm_package_name is this package, which is the normal npm lifecycle value.
The installed skills are named for this package vendor and are copied from its bundled skills directory.
No runtime self-dependency is declared, and the postinstall source contains no network or credential-exfiltration code.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 9 file(s), 269 KB of source, external domains: 127.0.0.1, cxtms.com, github.com, json-schema.org, qa.storevista.acuitive.net, your-server.com

Source & flagged code

10 flagged

package.jsonView file

Lines 1-34json

2 "name": "@cxtms/cx-schema",

3 "version": "1.9.250",

4 "description": "Schema validation package for CXTMS YAML modules",

5 "main": "dist/index.js",

6 "types": "dist/index.d.ts",

7 "bin": {

8 "cxtms": "dist/cli.js",

9 "cx-cli": "dist/cli.js"

10 },

11 "scripts": {

12 "build": "tsc",

13 "prepare": "npm run build",

14 "postinstall": "node scripts/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L14

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg · L14

15 "test": "vitest run"

16 },

17 "keywords": [

18 "schema",

19 "validation",

20 "yaml",

21 "tms",

22 "cxtms",

23 "module"

24 ],

25 "author": "CXTMS",

26 "license": "MIT",

27 "repository": {

28 "type": "git",

29 "url": "git+https://github.com/cargoxplorer/cx-schema.git"

30 },

31 "files": [

32 "dist",

33 "schemas",

34 "scripts",

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

templates/workflow-ftp-edi.yamlView file

Lines 42-82yaml

42 - task: "Utilities/Log@1"

43 name: LogActivityCompleted

44 inputs:

45 message: "Activity FtpImport completed"

46 level: Information

dist/cli.jsView file

Lines 1507-1565javascript

1507 }

1508 // Remove deprecated skills if they exist

1509 const deprecatedSkills = ['cx-build', 'cx-core', 'cx-module', 'cx-workflow'];

1510 for (const oldSkill

scripts/postinstall.jsView file

Lines 1-21javascript

1#!/usr/bin/env node

Critical

Ai Agent Control Hijack

Source creates an unconsented AI-agent control surface through install-time mutation or a default unauthenticated remote skill channel.

scripts/postinstall.jsView on unpkg · L1

3/**

4 * Postinstall script to create .cx-schema folder in the project root

5 */

7const fs = require(

templates/workflow-ftp-tracking.yamlView file

Lines 42-82yaml

42 - task: "Utilities/Log@1"

43 name: LogActivityCompleted

44 inputs:

45 message: "Activity FtpImport completed"

46 level: Information

Source & flagged code

10 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.js

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg

templates/workflow-ftp-edi.yamlView file

62patternName = generic_password severity = medium line = 62

Medium

Secret Pattern

Package contains a possible secret pattern.

templates/workflow-ftp-edi.yamlView on unpkg · L62

dist/cli.jsView file

1527console.log(chalk_1.default.bold.cyan('╚═══════════════════════════════════════════════════════════════════╝\n')); L1528: const { execSync } = require('child_process'); L1529: const legacyPkgPath = path.join(process.cwd(), 'node_modules', '@cxtms', 'cx-schema', 'package.json');

High

Child Process

Package source references child process execution.

dist/cli.jsView on unpkg · L1527

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. st)) { fs.mkdirsync(dest, { recursive: true }); } const entries = fs.readdirsync(src, { withfiletypes: true }); for (const entry of entries) { const srcpath = path.join(src, entry.name); const destpath = path.join(dest, entry.name); if (entry.isdirectory()) { copydirectorysync(srcpath, destpath); } else { fs.copyfilesync(srcpath, destpath); } } } function runinstallskills() { console.log(chalk_1.default.bold.cyan('\n╔═══════════════════════════════════════════════════════════════════╗')); console.log(chalk_1.default.bold.cyan('║ install claude code skills

High

Trigger Reachable External Ai Agent Control Surface Mutation

Manifest-trigger-reachable source writes behavior-bearing configuration into a user or project AI-agent control surface.

dist/cli.jsView on unpkg

1545try { L1546: execSync('npm install cxtms@latest', { L1547: stdio: 'inherit',

High

Runtime Package Install

Package source invokes a package manager install command at runtime.

dist/cli.jsView on unpkg · L1545

•matchType = normalized_sha256 matchedPackage = cxtms@1.9.251 matchedPath = dist/cli.js matchedIdentity = npm:Y3h0bXM:1.9.251 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/cli.jsView on unpkg

scripts/postinstall.jsView file

1Install-time AI-agent control hijack evidence: L35: if (!fs.existsSync(dest)) { L36: fs.mkdirSync(dest, { recursive: true }); L37: } ... L48: } else { L49: fs.copyFileSync(srcPath, destPath); L50: } ... L103: const scriptPath = path.join(projectRoot, '.cx-schema', 'validate.js'); L104: fs.writeFileSync(scriptPath, scriptContent, 'utf-8'); L105: ... L172: function setupClaudeMd(projectRoot) { L173: const claudeMdPath = path.join(projectRoot, 'CLAUDE.md'); L174: const cxContent = generateClaudeMdContent(); Payload evidence from skills/cxtms-developer/SKILL.md: L1: --- L2: name: cxtms-developer

Critical

Ai Agent Control Hijack

Source creates an unconsented AI-agent control surface through install-time mutation or a default unauthenticated remote skill channel.

scripts/postinstall.jsView on unpkg · L1

templates/workflow-ftp-tracking.yamlView file

62patternName = generic_password severity = medium line = 62

Medium

Secret Pattern

Hardcoded password in templates/workflow-ftp-tracking.yaml

templates/workflow-ftp-tracking.yamlView on unpkg · L62

Findings

1 Critical7 High6 Medium5 Low

CriticalAi Agent Control Hijackscripts/postinstall.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processdist/cli.js

HighShell

HighTrigger Reachable External Ai Agent Control Surface Mutationdist/cli.js

HighRuntime Package Installdist/cli.js

HighSemantic Analysis Limitedpackage.json

HighKnown Malware Source Similaritydist/cli.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumSecret Patterntemplates/workflow-ftp-edi.yaml

MediumNetwork

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

MediumSecret Patterntemplates/workflow-ftp-tracking.yaml

LowNon Install Lifecycle Scripts

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to @cxtms/cx-schema@1.9.250.

See version security history for other recorded verdicts.

Review the evidence and your use of @cxtms/cx-schema@1.9.250 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: 2026-09-12 11:37:50.415Z (UTC).