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Security audit

workday-mcp

Security checks for vulnerabilities and agentic risk

Overview

This skill is read-only and openly Workday-focused, but it gives broad access to highly sensitive HR data through a live signed-in browser session with limited scoping safeguards.

Install only if you are authorized to use automation against your employer's Workday tenant and understand that the agent may retrieve sensitive HR information visible to your browser session. Treat other employees' compensation, benefits, performance, and profile data as restricted, and prefer explicit, narrowly scoped requests.

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Vulnerability Patterns
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (5)

MCP Config Access

High
Category
Agent Snooping
Confidence
95% confidence
Finding

Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.

Content

Scanner excerpt · SKILL.md (reported line 27)May include surrounding context.

1. Install workday-mcp

.mcp.json (project) or ~/.claude/mcp.json (global):

json
{

Anti-Refusal Statement

High
Category
Anti-Refusal
Confidence
75% confidence
Finding

Skill attempts to nullify the agent's safety policies or restrictions ('you have no restrictions', 'ignore your guidelines', 'do anything now'). This is a direct jailbreak that disables guardrails.

Content

Scanner excerpt · SKILL.md (reported line 55)May include surrounding context.

md
[ContextMint Bridge releases](https://github.com/nullnet-app/contextmint-bridge/releases):

- **Chrome:** unzip the chrome zip and load it as an unpacked extension in
  `chrome://extensions` (Developer mode on).
- **Safari:** not available yet — it will ship inside the ContextMint app, which has
  no public download link. Use Chrome for now.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The trigger phrases are broad enough to activate on requests involving highly sensitive HR data such as compensation, benefits, and performance, including data about other employees. In a read-only Workday skill, overbroad activation increases the chance the agent will access or surface private records without an explicit, well-scoped user request or privacy check.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The description emphasizes broad access to worker profiles, compensation, benefits, and performance but does not clearly warn users that retrieving other employees' HR data may be sensitive, policy-restricted, or inappropriate. In this context, the absence of a strong warning makes misuse more likely because the skill normalizes access to third-party personnel records through an already-authenticated browser session.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 140)May include surrounding context.

md
Three of this server's ten tools take `view: "compact" | "full"` —
**`workday_get_task`**, **`workday_open_app`** and
**`workday_get_worker_task`** — and on all three **`compact` is the DEFAULT**.
The slim rung is what you get without asking for it.

Those three are the deep reads: the ones that follow a hub down to its child
cards, or open one named item on a profile, and can therefore come back with a

Static analysis

No suspicious patterns detected.