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Common Weakness Enumeration

CWE-939

Allowed

Improper Authorization in Handler for Custom URL Scheme

Abstraction: Base · Status: Incomplete

The product uses a handler for a custom URL scheme, but it does not properly restrict which actors can invoke the handler using the scheme.

42 vulnerabilities reference this CWE, most recent first.

CVE-2021-31384 (GCVE-0-2021-31384)

Vulnerability from cvelistv5 – Published: 2021-10-19 18:17 – Updated: 2024-09-16 17:37
VLAI
Title
Junos OS: SRX Series: Under a specific device configuration an attacker can access the devices J-Web management services from any interface, regardless of security settings protecting the service
Summary
Due to a Missing Authorization weakness and Insufficient Granularity of Access Control in a specific device configuration, a vulnerability exists in Juniper Networks Junos OS on SRX Series whereby an attacker who attempts to access J-Web administrative interfaces can successfully do so from any device interface regardless of the web-management configuration and filter rules which may otherwise protect access to J-Web. This issue affects: Juniper Networks Junos OS SRX Series 20.4 version 20.4R1 and later versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. This issue does not affect Juniper Networks Junos OS versions prior to 20.4R1.
CWE
  • CWE-285 - Improper Authorization
  • CWE-862 - Missing Authorization
  • CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
  • CWE-939 - Improper Authorization in Handler for Custom URL Scheme
  • CWE-1220 - Insufficient Granularity of Access Control
References
URL Tags
https://kb.juniper.net/ x_refsource_MISC
Impacted products
Vendor Product Version
Juniper Networks Junos OS Unaffected: unspecified , < 20.4R1 (custom)
Affected: 20.4R1 , < 20.4* (custom)
Affected: 21.1 , < 21.1R1-S1, 21.1R2 (custom)
Create a notification for this product.
Date Public
2021-10-13 00:00
Show details on NVD website

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CVE-2020-11000 (GCVE-0-2020-11000)

Vulnerability from cvelistv5 – Published: 2020-04-08 16:30 – Updated: 2024-08-04 11:21
VLAI
Title
Improper URL validation in GreenBrowser
Summary
GreenBrowser before version 1.2 has a vulnerability where apps that rely on URL Parsing to verify that a given URL is pointing to a trust server may be susceptible to many different ways to get URL parsing and verification wrong, which allows an attacker to circumvent the access control. This problem has been patched in version 1.2.
CWE
  • CWE-939 - Improper Authorization in Handler for Custom URL Scheme
References
Impacted products
Show details on NVD website

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GHSA-499R-H8WP-RFVM

Vulnerability from github – Published: 2024-09-09 09:30 – Updated: 2024-09-16 14:37
VLAI
Details

Improper authorization in handler for custom URL scheme issue in "@cosme" App for Android versions prior 5.69.0 and "@cosme" App for iOS versions prior to 6.74.0 allows an attacker to lead a user to access an arbitrary website via the vulnerable App. As a result, the user may become a victim of a phishing attack.

Show details on source website

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    }
  ]
}

GHSA-4W34-678C-Q5HP

Vulnerability from github – Published: 2023-11-15 00:31 – Updated: 2024-09-19 15:30
VLAI
Details

Improper authorization in some Zoom clients may allow an authorized user to conduct an escalation of privilege via network access.

Show details on source website

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      "url": "https://explore.zoom.us/en/trust/security/security-bulletin"
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}

GHSA-589R-WG5P-VWJQ

Vulnerability from github – Published: 2026-06-12 21:31 – Updated: 2026-06-12 21:31
VLAI
Details

Improper Authorization in Handler for Custom URL Scheme in Zoom Workplace before version 7.0.4 for Android and before 7.0.3 for iOS may allow an unauthenticated user to conduct an escalation of privilege via network access.

Show details on source website

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  "affected": [],
  "aliases": [
    "CVE-2026-53408"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-939"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-12T19:16:30Z",
    "severity": "HIGH"
  },
  "details": "Improper Authorization in Handler for Custom URL Scheme in Zoom Workplace before version 7.0.4 for Android and before 7.0.3 for iOS may allow an unauthenticated user to conduct an escalation of privilege via network access.",
  "id": "GHSA-589r-wg5p-vwjq",
  "modified": "2026-06-12T21:31:45Z",
  "published": "2026-06-12T21:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53408"
    },
    {
      "type": "WEB",
      "url": "https://www.zoom.com/en/trust/security-bulletin/zsb-26010"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-5MF6-5MJF-6V7R

Vulnerability from github – Published: 2026-03-10 21:32 – Updated: 2026-03-10 21:32
VLAI
Details

Cwe is not in rca categories in Microsoft Authenticator allows an unauthorized attacker to disclose information locally.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-26123"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-939"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-10T20:16:34Z",
    "severity": "MODERATE"
  },
  "details": "Cwe is not in rca categories in Microsoft Authenticator allows an unauthorized attacker to disclose information locally.",
  "id": "GHSA-5mf6-5mjf-6v7r",
  "modified": "2026-03-10T21:32:17Z",
  "published": "2026-03-10T21:32:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26123"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26123"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-5QHV-X9J4-C3VM

Vulnerability from github – Published: 2026-04-04 05:37 – Updated: 2026-04-06 23:43
VLAI
Summary
@mobilenext/mobile-mcp: Arbitrary Android Intent Execution via mobile_open_url
Details

Summary

The mobile_open_url tool in mobile-mcp passes user-supplied URLs directly to Android's intent system without any scheme validation, allowing execution of arbitrary Android intents, including USSD codes, phone calls, SMS messages, and content provider access.

Details

The vulnerable code passes URLs directly to adb shell am start -a android.intent.action.VIEW -d <url> without checking the URL scheme. This can enable malicious schemes such as tel:, sms:, mailto:, content://, and market:// to be executed.

Since MCP servers are designed to be operated by AI agents, which are vulnerable to prompt injection attacks, a malicious document or website could inject instructions that cause the AI to execute dangerous intents on a connected mobile device.

Impact

An attacker via prompt injection can: - Execute USSD codes (e.g., tel:*#06# to display IMEI - confirmed on Pixel 7a, behavior varies by device; or device-specific factory reset codes) - Initiate phone calls to premium rate numbers - Draft SMS messages with attacker-controlled content - Access content providers (contacts, SMS, call logs) - Open app installation prompts

Proof of Concept

{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"mobile_open_url","arguments":{"device":"<id>","url":"tel:*#06#"}}}

Result: IMEI displayed on device.

{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"mobile_open_url","arguments":{"device":"<id>","url":"sms:1234567890?body=HACKED"}}}

Result: SMS app opens with a pre-filled message.

Remediation

Upgrade to version 0.0.50 or later, which restricts mobile_open_url to http:// and https:// schemes by default. Users who require other URL schemes can opt in by setting MOBILEMCP_ALLOW_UNSAFE_URLS=1.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@mobilenext/mobile-mcp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.50"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35394"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-939"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-04T05:37:10Z",
    "nvd_published_at": "2026-04-06T21:16:21Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe `mobile_open_url` tool in mobile-mcp passes user-supplied URLs directly to Android\u0027s intent system without any scheme validation, allowing execution of arbitrary Android intents, including USSD codes, phone calls, SMS messages, and content provider access.\n\n### Details\n\nThe vulnerable code passes URLs directly to `adb shell am start -a android.intent.action.VIEW -d \u003curl\u003e` without checking the URL scheme. This can enable malicious schemes such as `tel:`, `sms:`, `mailto:`, `content://`, and `market://` to be executed.\n\nSince MCP servers are designed to be operated by AI agents, which are vulnerable to prompt injection attacks, a malicious document or website could inject instructions that cause the AI to execute dangerous intents on a connected mobile device.\n\n### Impact\n\nAn attacker via prompt injection can:\n- Execute USSD codes (e.g., `tel:*#06#` to display IMEI - confirmed on Pixel 7a, behavior varies by device; or device-specific factory reset codes)\n- Initiate phone calls to premium rate numbers\n- Draft SMS messages with attacker-controlled content\n- Access content providers (contacts, SMS, call logs)\n- Open app installation prompts\n\n### Proof of Concept\n```json\n{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"mobile_open_url\",\"arguments\":{\"device\":\"\u003cid\u003e\",\"url\":\"tel:*#06#\"}}}\n```\n\nResult: IMEI displayed on device.\n```json\n{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"mobile_open_url\",\"arguments\":{\"device\":\"\u003cid\u003e\",\"url\":\"sms:1234567890?body=HACKED\"}}}\n```\n\nResult: SMS app opens with a pre-filled message.\n\n### Remediation\n\nUpgrade to version 0.0.50 or later, which restricts `mobile_open_url` to `http://` and `https://` schemes by default. Users who require other URL schemes can opt in by setting `MOBILEMCP_ALLOW_UNSAFE_URLS=1`.",
  "id": "GHSA-5qhv-x9j4-c3vm",
  "modified": "2026-04-06T23:43:53Z",
  "published": "2026-04-04T05:37:10Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mobile-next/mobile-mcp/security/advisories/GHSA-5qhv-x9j4-c3vm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35394"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mobile-next/mobile-mcp/pull/299"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mobile-next/mobile-mcp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mobile-next/mobile-mcp/releases/tag/0.0.50"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@mobilenext/mobile-mcp: Arbitrary Android Intent Execution via mobile_open_url"
}

GHSA-6WM5-G9M5-854V

Vulnerability from github – Published: 2024-12-17 06:30 – Updated: 2024-12-17 06:30
VLAI
Details

Improper authorization in handler for custom URL scheme issue in "Shonen Jump+" App for Android versions prior to 4.0.0 allows an attacker to lead a user to access an arbitrary website via the vulnerable App. As a result, the user may become a victim of a phishing attack.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-54125"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-939"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-17T06:15:21Z",
    "severity": "LOW"
  },
  "details": "Improper authorization in handler for custom URL scheme issue in \"Shonen Jump+\" App for Android versions prior to 4.0.0 allows an attacker to lead a user to access an arbitrary website via the vulnerable App. As a result, the user may become a victim of a phishing attack.",
  "id": "GHSA-6wm5-g9m5-854v",
  "modified": "2024-12-17T06:30:33Z",
  "published": "2024-12-17T06:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-54125"
    },
    {
      "type": "WEB",
      "url": "https://jvn.jp/en/jp/JVN08430039"
    },
    {
      "type": "WEB",
      "url": "https://shonenjumpplus.com/article/info20241216"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-7MFW-WGR7-M3JG

Vulnerability from github – Published: 2025-05-21 18:33 – Updated: 2025-05-21 21:31
VLAI
Details

Opening maliciously-crafted URLs in Firefox from other apps such as Safari could have allowed attackers to spoof website addresses if the URLs utilized non-HTTP schemes used internally by the Firefox iOS client This vulnerability affects Firefox for iOS < 139.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-5020"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-939"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-21T18:15:53Z",
    "severity": "MODERATE"
  },
  "details": "Opening maliciously-crafted URLs in Firefox from other apps such as Safari could have allowed attackers to spoof website addresses if the URLs utilized non-HTTP schemes used internally by the Firefox iOS client This vulnerability affects Firefox for iOS \u003c 139.",
  "id": "GHSA-7mfw-wgr7-m3jg",
  "modified": "2025-05-21T21:31:40Z",
  "published": "2025-05-21T18:33:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-5020"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1951558"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-39"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-7MW8-P48C-365R

Vulnerability from github – Published: 2026-08-10 09:31 – Updated: 2026-08-19 03:31
VLAI
Details

Authorization bypass in SemClipboardService prior to SMR Aug-2026 Release 1 allows local attackers to access clipboard data.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-21062"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-939"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T08:16:48Z",
    "severity": "MODERATE"
  },
  "details": "Authorization bypass in SemClipboardService prior to SMR Aug-2026 Release 1 allows local attackers to access clipboard data.",
  "id": "GHSA-7mw8-p48c-365r",
  "modified": "2026-08-19T03:31:18Z",
  "published": "2026-08-10T09:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21062"
    },
    {
      "type": "WEB",
      "url": "https://security.samsungmobile.com/securityUpdate.smsb?year=2026\u0026month=08"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Mitigation
Architecture and Design
  • Utilize a user prompt pop-up to authorize potentially harmful actions such as those modifying data or dealing with sensitive information.
  • When designing functionality of actions in the URL scheme, consider whether the action should be accessible to all mobile applications, or if an allowlist of applications to interface with is appropriate.

No CAPEC attack patterns related to this CWE.