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Security audit

卖家之家(跨境电商)问答搜索

Security checks for vulnerabilities and agentic risk

Overview

The skill does what it claims for 卖家之家 Q&A, but its broad trigger rules can cause unintended posting, account lookup, or token-backed API use.

Review before installing. Only use this skill if you intend your agent to access 卖家之家 with MJZJ_API_KEY. Be especially careful with generic requests like asking a question or searching questions, because the skill may route them to this service; confirm before posting questions or using bounty/watch payment fields.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (7)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The trigger guidance includes broad natural-language phrases such as “提问 / 搜索问题 / 我的问答”, which can match common user intents outside this specific service. In an agent environment, that can cause the skill to activate unexpectedly and route user data or actions to this external API when the user did not clearly intend to use 卖家之家.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The phrase-to-endpoint mapping lacks clear disambiguation boundaries, so generic requests like “查找问题” or “帮我提问” may invoke this skill even when the user means a different site, system, or internal task. Because some mapped actions include account-specific retrieval and question posting, ambiguous activation increases the risk of unintended data access or unintended external side effects.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 79)May include surrounding context.

1) 查询问答分类列表(/api/ask/getCategories)

bash
curl -X GET "https://data.mjzj.com/api/ask/getCategories" \
  -H "Content-Type: application/json"

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 79)May include surrounding context.

1) 查询问答分类列表(/api/ask/getCategories)

bash
curl -X GET "https://data.mjzj.com/api/ask/getCategories" \
  -H "Content-Type: application/json"

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 114)May include surrounding context.

1) 查询问答分类列表(/api/ask/getCategories)

bash
curl -X GET "https://data.mjzj.com/api/ask/getCategories" \
  -H "Content-Type: application/json"

External Transmission

Medium
Category
Data Exfiltration
Confidence
78% confidence
Finding

This endpoint transmits user-authored content and a bearer token to an external service and performs a state-changing action (posting a question). While that is core functionality, it becomes security-relevant because broad trigger rules elsewhere in the skill could cause unintended posting or unintended disclosure of user content to the third party.

Content

Scanner excerpt · SKILL.md (reported line 89)May include surrounding context.

若发布失败,提示用户:发布未成功,你可以前往 https://mjzj.com/ask/create 手动发布。

bash
curl -X POST "https://data.mjzj.com/api/ask/createQuestion" \
  -H "Authorization: Bearer $MJZJ_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{

External Transmission

Medium
Category
Data Exfiltration
Confidence
84% confidence
Finding

This endpoint sends an authorization token to retrieve the user’s private posted questions from a third-party service. Access to private/account-scoped data is expected for functionality, but in combination with the skill’s broad activation rules it creates a real risk of unintended private-data retrieval from the external platform.

Content

Scanner excerpt · SKILL.md (reported line 130)May include surrounding context.

倒序游标分页。首次请求 position 传空字符串或不传;后续传上一页返回的 nextPosition。

bash
curl -X GET "https://data.mjzj.com/api/ask/queryMyQuestions?size=20&position=" \
  -H "Authorization: Bearer $MJZJ_API_KEY" \
  -H "Content-Type: application/json"

Static analysis

No suspicious patterns detected.