Vulnerabilities in pkg:maven/org.apache.cxf/cxf-rt-rs-security-oauth2

PACKAGE
Advisory Identifier: GHSA-83r6-96m8-r52p
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Advisory Summary

CVE-2026-50631 is a HIGH (CVSS 7.4) apache cxf oauth2 toctou race vulnerability (CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition) affecting Cxf rt rs security oauth2 libraries in the Maven ecosystem. The issue involves apache cxf oauth2 toctou race condition in refresh token processing. Remediation is available by upgrading affected packages to version 4.2.2, 4.1.7.

6 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:maven/org.apache.cxf/cxf-rt-rs-security-oauth2

6 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:maven/org.apache.cxf/cxf-rt-rs-security-oauth2. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-83r6-96m8-r52p CVE-2026-50631 HIGH Apache CXF OAuth2 TOCTOU Race Condition in Refresh Token Processing
GHSA-xf62-wr5p-5p95 CVE-2026-50630 MODERATE Apache CXF OAuth2 HTTP Response Splitting via WWW-Authenticate Realm Injection
GHSA-9mrv-8pvf-hf4m CVE-2026-50627 CRITICAL Apache CXF OAuth2 Missing JWT Audience and Issuer Validation in Access Token Validator
GHSA-g5v7-jchf-7jrr CVE-2026-50628 CRITICAL Apache CXF OAuth2 has Inverted IP Binding Check that Defeats Security Control
GHSA-f8p7-h97q-7vx7 CVE-2026-50629 HIGH Apache CXF OAuth2 Log Injection via Unsanitized Client Identifier
GHSA-542g-m3fx-q86f CVE-2026-50623 MODERATE Apache CXF has Authentication Bypass in OAuth2 TokenIntrospectionService

CVE-2026-50631 at a Glance

CVE Identifier CVE-2026-50631
GHSA Identifier GHSA-83r6-96m8-r52p
Severity HIGH
CVSS v3.1 Base Score 7.4
CWE Classification CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Product Cxf rt rs security oauth2
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.4

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2026-50631

To remediate this vulnerability, upgrade all affected Cxf rt rs security oauth2 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.apache.cxf:cxf-rt-rs-security-oauth2 fixed: 4.2.2 
<dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-rt-rs-security-oauth2</artifactId>
    <version>4.2.2</version>
</dependency>
org.apache.cxf:cxf-rt-rs-security-oauth2 fixed: 4.1.7 
<dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-rt-rs-security-oauth2</artifactId>
    <version>4.1.7</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.apache.cxf

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-50631, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.cxf

Analyze the terminal output to locate any version of Cxf rt rs security oauth2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.2.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.cxf 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-367: Time-of-check Time-of-use (TOCTOU) Race Condition, where the product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. In Cxf rt rs security oauth2, 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 race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.

CVE-2026-50631 Affected Cxf rt rs security oauth2 Versions

2 component(s)
Fixed Versions:
4.2.24.1.7
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.cxf:cxf-rt-rs-security-oauth2
maven/org.apache.cxf/cxf-rt-rs-security-oauth2
Maven
≥ 4.2.0
< 4.2.2
4.2.2
org.apache.cxf:cxf-rt-rs-security-oauth2
maven/org.apache.cxf/cxf-rt-rs-security-oauth2
Maven
< 4.1.7
4.1.7

References

NVD — CVE-2026-50631 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50631
Cxf rt rs security oauth2 Source Repository REPOSITORY
https://github.com/apache/cxf
lists.apache.org/thread/s83t3x4r626o... WEB
https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8
Cxf rt rs security oauth2 Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/06/11/8

Frequently Asked Questions

What is CVE-2026-50631?
CVE-2026-50631 is a security vulnerability in Cxf rt rs security oauth2 involving Apache CXF OAuth2 TOCTOU Race Condition in Refresh Token Processing under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition.
Which Cxf rt rs security oauth2 versions are affected?
Affected versions include releases prior to 4.2.2, 4.1.7 across affected packages: org.apache.cxf:cxf-rt-rs-security-oauth2.
What version fixes CVE-2026-50631?
Upgrading to 4.2.2, 4.1.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is cxf-rt-rs-security-oauth2 affected?
Yes, org.apache.cxf:cxf-rt-rs-security-oauth2 is affected in releases prior to 4.2.2, 4.1.7. Upgrade your dependency to 4.2.2, 4.1.7 or later.
What is the CVSS score of CVE-2026-50631?
CVE-2026-50631 has a CVSS v3.1 base score of 7.4 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-50631?
CVE-2026-50631 is classified under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition (The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.).
How can I check Maven dependencies for CVE-2026-50631?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.cxf'. 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-83r6-96m8-r52p",
  "modified" : "2026-08-20T18:32:34Z",
  "published" : "2026-06-12T12:31:33Z",
  "aliases" : [ "CVE-2026-50631" ],
  "summary" : "Apache CXF OAuth2 TOCTOU Race Condition in Refresh Token Processing",
  "details" : "A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
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      "ecosystem" : "Maven",
      "name" : "org.apache.cxf:cxf-rt-rs-security-oauth2"
    },
    "ranges" : [ {
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      "events" : [ {
        "introduced" : "4.2.0"
      }, {
        "fixed" : "4.2.2"
      } ]
    } ]
  }, {
    "package" : {
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.1.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50631"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/cxf"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/06/11/8"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-367" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-20T18:32:34Z",
    "nvd_published_at" : "2026-06-12T10:16:23Z"
  }
}