Common Weakness Enumeration
CWE-939
AllowedImproper 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.
41 vulnerabilities reference this CWE, most recent first.
GHSA-XM5C-4GF9-QF8C
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.
Severity
8.1 (High)
{
"affected": [],
"aliases": [
"CVE-2026-53407"
],
"database_specific": {
"cwe_ids": [
"CWE-939"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-12T19:16:29Z",
"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-xm5c-4gf9-qf8c",
"modified": "2026-06-12T21:31:44Z",
"published": "2026-06-12T21:31:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53407"
},
{
"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"
}
]
}
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.