CVE-2026-15573: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-6j7g-hr6v-3hxc
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CVSS 8.1
CWE-551 CWE-178
Published
Advisory Summary

CVE-2026-15573 is a HIGH (CVSS 8.1) security vulnerability vulnerability (CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization) affecting Software libraries in the Maven ecosystem. The weakness occurs when if a web server does not fully parse requested urls before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-15573 at a Glance

CVE Identifier CVE-2026-15573
GHSA Identifier GHSA-6j7g-hr6v-3hxc
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-15573

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-2026-15573, 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-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization, where if a web server does not fully parse requested urls before it examines them for authorization, it may be possible for an attacker to bypass authorization protection. 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

A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs before comparison. By adding extra characters like a trailing slash or matrix parameters to a URL, an attacker can trick the system into applying a less restrictive security policy than intended. This allows an authenticated user to access administrative or restricted areas they should not have permission to see.

References

NVD — CVE-2026-15573 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15573
access.redhat.com/errata/rhsa-2026:50... WEB
https://access.redhat.com/errata/RHSA-2026:50846
access.redhat.com/errata/rhsa-2026:50... WEB
https://access.redhat.com/errata/RHSA-2026:50847
access.redhat.com/errata/rhsa-2026:50... WEB
https://access.redhat.com/errata/RHSA-2026:50848
access.redhat.com/errata/rhsa-2026:50... WEB
https://access.redhat.com/errata/RHSA-2026:50849
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-15573
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2499593

Frequently Asked Questions

What is CVE-2026-15573?
CVE-2026-15573 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-15573?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-15573?
CVE-2026-15573 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-15573?
CVE-2026-15573 is classified under CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization (If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.).
How can I check Maven dependencies for CVE-2026-15573?
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-6j7g-hr6v-3hxc",
  "modified" : "2026-08-05T18:31:34Z",
  "published" : "2026-08-05T15:32:22Z",
  "aliases" : [ "CVE-2026-15573" ],
  "details" : "A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs before comparison. By adding extra characters like a trailing slash or matrix parameters to a URL, an attacker can trick the system into applying a less restrictive security policy than intended. This allows an authenticated user to access administrative or restricted areas they should not have permission to see.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-15573"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:50846"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:50847"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:50848"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:50849"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-15573"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2499593"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-178", "CWE-551" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-05T15:16:36Z"
  }
}