CVE-2026-76186: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-xhp3-rrf4-c8rv
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CVSS 9.1
CWE-565
Published
Advisory Summary

CVE-2026-76186 is a CRITICAL (CVSS 9.1) security vulnerability vulnerability (CWE-565: Reliance on Cookies without Validation and Integrity Checking) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-76186 at a Glance

CVE Identifier CVE-2026-76186
GHSA Identifier GHSA-xhp3-rrf4-c8rv
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-565: Reliance on Cookies without Validation and Integrity Checking
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.1

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-76186

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-2026-76186, 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-565: Reliance on Cookies without Validation and Integrity Checking, where the product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user. 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 Keycloak provider: from Airflow 3.3 the Keycloak auth manager takes a user's identity from the signed Airflow session token but takes the Keycloak access and refresh tokens used for every authorization decision from separate, unauthenticated cookies, and never checks that the two describe the same subject. A user who holds any valid Airflow login of their own, together with another subject's Keycloak access or refresh token obtained out of band, can pair the two: Airflow then authorizes requests with the foreign token's privileges while the session identity, audit log and cache keys continue to name the attacker's own account. The refresh path re-issues an Airflow session token for the original identity carrying the foreign tokens, so the mismatched pairing survives across sessions. Affects deployments running Airflow 3.3 or later with the Keycloak auth manager. Earlier versions carried the Keycloak tokens inside the signed session token, so the binding existed and was lost when they moved into separate cookies. Users of apache-airflow-providers-keycloak are recommended to upgrade to version 0.10.0 or later, which binds the cookie-supplied tokens to the session identity.

References

NVD — CVE-2026-76186 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-76186
Software Source Repository REPOSITORY
https://github.com/apache/airflow/pull/72207
lists.apache.org/thread/5cqh5ojl3718... WEB
https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3
lists.apache.org/thread/5cqh5ojl3718... WEB
https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3?users@airflow.apache.org
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/09/15/8

Frequently Asked Questions

What is CVE-2026-76186?
CVE-2026-76186 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-565: Reliance on Cookies without Validation and Integrity Checking.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-76186?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-76186?
CVE-2026-76186 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-76186?
CVE-2026-76186 is classified under CWE-565: Reliance on Cookies without Validation and Integrity Checking (The product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user.).
How can I check Maven dependencies for CVE-2026-76186?
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-xhp3-rrf4-c8rv",
  "modified" : "2026-09-17T21:31:34Z",
  "published" : "2026-09-16T12:30:31Z",
  "aliases" : [ "CVE-2026-76186" ],
  "details" : "Apache Airflow Keycloak provider: from Airflow 3.3 the Keycloak auth manager takes a user's identity from the signed Airflow session token but takes the Keycloak access and refresh tokens used for every authorization decision from separate, unauthenticated cookies, and never checks that the two describe the same subject. A user who holds any valid Airflow login of their own, together with another subject's Keycloak access or refresh token obtained out of band, can pair the two: Airflow then authorizes requests with the foreign token's privileges while the session identity, audit log and cache keys continue to name the attacker's own account. The refresh path re-issues an Airflow session token for the original identity carrying the foreign tokens, so the mismatched pairing survives across sessions.\n\nAffects deployments running Airflow 3.3 or later with the Keycloak auth manager. Earlier versions carried the Keycloak tokens inside the signed session token, so the binding existed and was lost when they moved into separate cookies.\n\nUsers of apache-airflow-providers-keycloak are recommended to upgrade to version 0.10.0 or later, which binds the cookie-supplied tokens to the session identity.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-76186"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/airflow/pull/72207"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3?users@airflow.apache.org"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/09/15/8"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-565" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T10:16:52Z"
  }
}