CVE-2026-21075: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-grg8-xhr3-987r
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CWE-939
Published
Advisory Summary

CVE-2026-21075 is a MODERATE security vulnerability vulnerability (CWE-939: Improper Authorization in Handler for Custom URL Scheme) affecting Software libraries in the Maven ecosystem. The weakness occurs when 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.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-21075 at a Glance

CVE Identifier CVE-2026-21075
GHSA Identifier GHSA-grg8-xhr3-987r
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-939: Improper Authorization in Handler for Custom URL Scheme
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-21075

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-21075, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-939: Improper Authorization in Handler for Custom URL Scheme, where 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. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Improper authorization in handler for custom URL scheme in My Galaxy prior to version 6.3 allows remote attackers to access sensitive information.

References

NVD — CVE-2026-21075 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21075
Software Security Information SECURITY
https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=08

Frequently Asked Questions

What is CVE-2026-21075?
CVE-2026-21075 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-939: Improper Authorization in Handler for Custom URL Scheme.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-21075?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-21075?
CVE-2026-21075 is classified under 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.).
How can I check Maven dependencies for CVE-2026-21075?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-grg8-xhr3-987r",
  "modified" : "2026-08-10T09:31:23Z",
  "published" : "2026-08-10T09:31:23Z",
  "aliases" : [ "CVE-2026-21075" ],
  "details" : "Improper authorization in handler for custom URL scheme in My Galaxy prior to version 6.3 allows remote attackers to access sensitive information.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-21075"
  }, {
    "type" : "WEB",
    "url" : "https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=08"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-939" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-10T09:17:21Z"
  }
}