CVE-2026-86466: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-6fx3-rxq6-j8w2
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CVSS 8.1
CWE-346
Published
Advisory Summary

CVE-2026-86466 is a HIGH (CVSS 8.1) security vulnerability vulnerability (CWE-346: Origin Validation Error) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not properly verify that the source of data or communication is valid.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-86466 at a Glance

CVE Identifier CVE-2026-86466
GHSA Identifier GHSA-6fx3-rxq6-j8w2
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-346: Origin Validation Error
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-2026-86466

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-2026-86466, 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-346: Origin Validation Error, where the product does not properly verify that the source of data or communication is valid. 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

Apache Airflow FAB provider: the Authentik OAuth path in the FAB auth manager does not validate the issuer or audience claims of the id_token it accepts. An attacker holding a token that the same Authentik identity provider minted for a different client application can present it to Airflow and be authenticated as the user it names, because the audience claim is never checked. Affects deployments using the FAB auth manager with Authentik OAuth where the same Authentik instance also serves other applications; the attacker needs a valid token for any of those other applications, not for Airflow. CVE-2026-75156 corrected the same missing validation on the Azure AD path in this file; the Authentik path was left unchanged and is fixed here. Deployments that applied the CVE-2026-75156 fix and use Authentik must also upgrade for this one. Users of apache-airflow-providers-fab are recommended to upgrade to version 3.9.0 or later, which fixes the issue.

References

NVD — CVE-2026-86466 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86466
Software Source Repository REPOSITORY
https://github.com/apache/airflow/pull/72645
lists.apache.org/thread/qh7fobs16p2h... WEB
https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7
lists.apache.org/thread/qh7fobs16p2h... WEB
https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7?users@airflow.apache.org
CVE Official Record — CVE-2026-86466 CVE
https://www.cve.org/CVERecord?id=CVE-2026-75156

Frequently Asked Questions

What is CVE-2026-86466?
CVE-2026-86466 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-346: Origin Validation Error.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-86466?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-86466?
CVE-2026-86466 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-2026-86466?
CVE-2026-86466 is classified under CWE-346: Origin Validation Error (The product does not properly verify that the source of data or communication is valid.).
How can I check Maven dependencies for CVE-2026-86466?
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-6fx3-rxq6-j8w2",
  "modified" : "2026-09-17T21:31:35Z",
  "published" : "2026-09-16T12:30:32Z",
  "aliases" : [ "CVE-2026-86466" ],
  "details" : "Apache Airflow FAB provider: the Authentik OAuth path in the FAB auth manager does not validate the issuer or audience claims of the id_token it accepts. An attacker holding a token that the same Authentik identity provider minted for a different client application can present it to Airflow and be authenticated as the user it names, because the audience claim is never checked. Affects deployments using the FAB auth manager with Authentik OAuth where the same Authentik instance also serves other applications; the attacker needs a valid token for any of those other applications, not for Airflow.\n\nCVE-2026-75156 corrected the same missing validation on the Azure AD path in this file; the Authentik path was left unchanged and is fixed here. Deployments that applied the CVE-2026-75156 fix and use Authentik must also upgrade for this one.\n\nUsers of apache-airflow-providers-fab are recommended to upgrade to version 3.9.0 or later, which fixes the issue.",
  "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-2026-86466"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/airflow/pull/72645"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7?users@airflow.apache.org"
  }, {
    "type" : "WEB",
    "url" : "https://www.cve.org/CVERecord?id=CVE-2026-75156"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-346" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T10:16:54Z"
  }
}