Weakness (CWE)
CWE-939: Improper Authorization in Handler for Custom URL Scheme
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.
More detail
Mobile platforms and other architectures allow the use of custom URL schemes to facilitate communication between applications. In the case of iOS, this is the only method to do inter-application communication. The implementation is at the developer's discretion which may open security flaws in the application. An example could be potentially dangerous functionality such as modifying files through a custom URL scheme.
How to prevent it (1 mitigation)
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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.
Source: MITRE CWE-939
22 results · Clear filters · Feed
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Medium 6.5
ReelShort for Android version 3.8.55 loads an attacker-controlled activityUrl supplied through its cmsvictor://open dee…
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Medium 5.4
NewsBreak for Android version 26.21.0 treats data:text/html; URLs as trusted in its WebView JavaScript bridge origin ch…
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Medium 5.8
Dell Alienware Command Center (AWCC), version(s) Versions up to and including 6.14.20.0, contain(s) an Improper Authori…
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Medium 5.9
n8n before 2.41.4 and 2.42.1 Local Gateway Deep-Link Silent Re-pairing to Attacker Instance
n8n before 2.41.4 and 2.42.x before 2.42.1 contains a missing confirmation vulnerability in the Local Gateway desktop app that allows its deep-link connect handler to silently re-pair the app with a different n8n instance. Attackers can lure users running the…
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Medium 6.3
Nerimity Desktop Window Open mainWindow.js shell.openExternal improper authorization in handler for custom url scheme
A vulnerability was found in Nerimity Desktop up to 2.2.2. Affected by this issue is the function shell.openExternal of the file src/mainWindow.js of the component Window Open Handler. The manipulation of the argument url results in improper authorization in …
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Medium 5.4
"ゲオアプリ" provided by GEO CORPORATION is vulnerable to improper authorization in handler for a custom URL scheme. An atta…
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Medium 5.3
Android application "Myna Point" is vulnerable to Improper Authorization in Handler for Custom URL Scheme (CWE-939). A …
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Medium 5.3
Improper authorization in handler for custom URL scheme in My Galaxy prior to version 6.3 allows remote attackers to ac…
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Medium 4.8
Authorization bypass in SemClipboardService prior to SMR Aug-2026 Release 1 allows local attackers to access clipboard …
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Medium 4.3
Home Assistant Companion: `homeassistant://invite` Deep Link Credential Phishing
Home Assistant is open source home automation software focused on local control and privacy. Prior to 2026.6.1, the Android Companion app is vulnerable to an open redirect. The app passes the URL fragment from a homeassistant://invite deep link into the onboa…
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Medium 5.3
Genspark AI Workspace App ai.mainfunc.genspark improper authorization in handler for custom url scheme
A vulnerability has been found in Genspark AI Workspace App 2.8.4 on Android. This vulnerability affects unknown code of the component ai.mainfunc.genspark. The manipulation leads to improper authorization in handler for custom url scheme. The attack can only…
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Medium 5.3
Moovit Bus & Public Transit App com.tranzmate improper authorization in handler for custom url scheme
A flaw has been found in Moovit Bus & Public Transit App 1.18 on Android. This affects an unknown part of the component com.tranzmate. Executing a manipulation can lead to improper authorization in handler for custom url scheme. The attack can only be execute…
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Medium 6.5
Opening a window with {{javascript:alert()}} as URL causes crash in the Mattermost Desktop App
Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent an invalid URL from loading in a pop-up window in the Mattermost Desktop App which allows a malicious server owner to repeated crash the application via calling {{window.open('javascript:ale…
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Medium 6.4
Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openExternal
Vikunja is an open-source self-hosted task management platform. Starting in version 0.21.0 and prior to version 2.2.0, the Vikunja Desktop Electron wrapper passes URLs from `window.open()` calls directly to `shell.openExternal()` without any validation or pro…
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Medium 5.5
Microsoft Authenticator Information Disclosure Vulnerability
Cwe is not in rca categories in Microsoft Authenticator allows an unauthorized attacker to disclose information locally.
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Medium 4.3
Improper authorization in handler for custom URL scheme issue in "Yahoo! Shopping" App for Android versions prior to 14…
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Medium 4.3
Links using non-HTTP schemes opened from other apps such as Safari could have allowed spoofing of website addresses
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 was fixed in Firefox for iOS…
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Medium 4.3
Improper authorization in handler for custom URL scheme issue in "@cosme" App for Android versions prior 5.69.0 and "@c…
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Medium 4.3
Improper authorization in handler for custom URL scheme issue in 'ZOZOTOWN' App for Android versions prior to 7.39.6 al…
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Medium 5.5
Improper authorization in some Zoom clients may allow an authorized user to conduct an escalation of privilege via netw…
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Medium 5.3
Cisco AppDynamics Controller Authorization Bypass Vulnerability
A vulnerability in the web-based management interface of Cisco AppDynamics Controller Software could allow an unauthenticated, remote attacker to access a configuration file and the login page for an administrative console that they would not normally have au…
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Medium 5.7
Improper URL validation in GreenBrowser
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 c…