CVE-2026-63301: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-4pmv-mf66-4v3h
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CWE-602
Published
Advisory Summary

CVE-2026-63301 is a HIGH security vulnerability vulnerability (CWE-602: Client-Side Enforcement of Server-Side Security) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-63301 at a Glance

CVE Identifier CVE-2026-63301
GHSA Identifier GHSA-4pmv-mf66-4v3h
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-602: Client-Side Enforcement of Server-Side Security
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-63301

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-2026-63301, 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-602: Client-Side Enforcement of Server-Side Security, where the product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server. 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

In Quick.CMS, the administrative user interface restricts deletion of the primary language by omitting the corresponding option from the interface; however, the underlying language-deletion API endpoint does not enforce an equivalent server-side authorization check. As a result, an authenticated administrator can bypass the UI-level restriction and delete the primary language by sending a direct HTTP request to the API endpoint. Successful deletion of the primary language results in a Denial of Service (DoS) of application. Critically, when combined with a separate Cross-Site Request Forgery (CSRF) vulnerability (CVE-2026-1468) an unauthenticated remote attacker can craft a malicious link, which if visited by an authenticated administrator, will trigger the DoS condition without direct access to the application The vendor assessed the likelihood of exploitation as very low and determined that a fix is not necessary.

References

NVD — CVE-2026-63301 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63301
cert.pl/en/posts/2026/07/cv... WEB
https://cert.pl/en/posts/2026/07/CVE-2026-63301
opensolution.org WEB
https://opensolution.org

Frequently Asked Questions

What is CVE-2026-63301?
CVE-2026-63301 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-602: Client-Side Enforcement of Server-Side Security.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-63301?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-63301?
CVE-2026-63301 is classified under CWE-602: Client-Side Enforcement of Server-Side Security (The product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server.).
How can I check Maven dependencies for CVE-2026-63301?
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-4pmv-mf66-4v3h",
  "modified" : "2026-07-28T12:31:20Z",
  "published" : "2026-07-28T12:31:20Z",
  "aliases" : [ "CVE-2026-63301" ],
  "details" : "In Quick.CMS, the administrative user interface restricts deletion of the primary language by omitting the corresponding option from the interface; however, the underlying language-deletion API endpoint does not enforce an equivalent server-side authorization check. As a result, an authenticated administrator can bypass the UI-level restriction and delete the primary language by sending a direct HTTP request to the API endpoint. Successful deletion of the primary language results in a Denial of Service (DoS) of application.\n\n\nCritically, when combined with a separate Cross-Site Request Forgery (CSRF) vulnerability (CVE-2026-1468) an unauthenticated remote attacker can craft a malicious link, which if visited by an authenticated administrator, will trigger the DoS condition without direct access to the application\n\n\n\n\nThe vendor assessed the likelihood of exploitation as very low and determined that a fix is not necessary.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:H/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-2026-63301"
  }, {
    "type" : "WEB",
    "url" : "https://cert.pl/en/posts/2026/07/CVE-2026-63301"
  }, {
    "type" : "WEB",
    "url" : "https://opensolution.org"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-602" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-28T11:17:03Z"
  }
}