CVE-2026-0707: Keycloak parent Authorization Before Parsing And Canonicalization Vulnerability

MODERATE
Advisory Identifier: GHSA-gv94-wp4h-vv8p
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CVSS 5.3
CWE-551
Published
Advisory Summary

CVE-2026-0707 is a MODERATE (CVSS 5.3) authorization before parsing and canonicalization vulnerability (CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization) affecting Keycloak parent libraries in the Maven ecosystem. The issue involves authorization before parsing and canonicalization. Remediation is available in the latest vendor maintenance releases.

CVE-2026-0707 at a Glance

CVE Identifier CVE-2026-0707
GHSA Identifier GHSA-gv94-wp4h-vv8p
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Affected Product Keycloak parent
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

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

How to Fix CVE-2026-0707

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

org.keycloak:keycloak-parent fixed: Latest secure release 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-parent</artifactId>
    <version>Latest secure release</version>
</dependency>
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 -Dincludes=org.keycloak

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-0707, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.keycloak

Analyze the terminal output to locate any version of Keycloak parent 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 -Dincludes=org.keycloak 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 Keycloak parent, 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. The Keycloak Authorization header parser is overly permissive regarding the formatting of the "Bearer" authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that deviate from RFC 6750 specifications.

CVE-2026-0707 Affected Keycloak parent Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-parent
maven/org.keycloak/keycloak-parent
Maven
≤ 26.5.0

References

NVD — CVE-2026-0707 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0707
Keycloak parent Source Repository REPOSITORY
https://github.com/keycloak/keycloak/issues/49433
access.redhat.com/errata/rhsa-2026:39... WEB
https://access.redhat.com/errata/RHSA-2026:3947
access.redhat.com/errata/rhsa-2026:39... WEB
https://access.redhat.com/errata/RHSA-2026:3948
Keycloak parent Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-0707
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2427768
Keycloak parent Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2026-0707?
CVE-2026-0707 is a security vulnerability in Keycloak parent involving Authorization Before Parsing and Canonicalization under CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization.
Which Keycloak parent versions are affected?
Affected versions include releases prior to current release patches across affected packages: org.keycloak:keycloak-parent.
What version fixes CVE-2026-0707?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-parent affected?
Yes, org.keycloak:keycloak-parent is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-0707?
CVE-2026-0707 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-0707?
CVE-2026-0707 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-2026-0707?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.keycloak'. 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-gv94-wp4h-vv8p",
  "modified" : "2026-06-09T11:58:24Z",
  "published" : "2026-01-08T06:31:32Z",
  "aliases" : [ "CVE-2026-0707" ],
  "summary" : "Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization",
  "details" : "A flaw was found in Keycloak. The Keycloak Authorization header parser is overly permissive regarding the formatting of the \"Bearer\" authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that deviate from RFC 6750 specifications.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-parent"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "26.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-0707"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/issues/49433"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:3947"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:3948"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-0707"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2427768"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-551" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-08T21:14:12Z",
    "nvd_published_at" : "2026-01-08T04:15:56Z"
  }
}