CVE-2026-50627: Cxf rt rs security oauth2 Apache CXF OAuth2 Missing JWT Vulnerability
CRITICALCVE-2026-50627 is a CRITICAL (CVSS 9.1) apache cxf oauth2 missing jwt vulnerability (CWE-303: Incorrect Implementation of Authentication Algorithm) affecting Cxf rt rs security oauth2 libraries in the Maven ecosystem. The issue involves apache cxf oauth2 missing jwt audience and issuer validation in access token validator. Remediation is available by upgrading affected packages to version 4.2.2, 4.1.7.
CVE-2026-50627 at a Glance
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:H/UI:N/S:C/C:H/I:H/A:H).
How to Fix CVE-2026-50627
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.
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-security-oauth2</artifactId>
<version>4.2.2</version>
</dependency><dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-security-oauth2</artifactId>
<version>4.1.7</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.apache.cxfHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-50627, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.apache.cxfAnalyze 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-303: Incorrect Implementation of Authentication Algorithm, where the requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect. 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
CVE-2026-50627 Affected Cxf rt rs security oauth2 Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
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 |
< 4.1.7
|
4.1.7
|
References
Frequently Asked Questions
What is CVE-2026-50627?
Which Cxf rt rs security oauth2 versions are affected?
What version fixes CVE-2026-50627?
Is cxf-rt-rs-security-oauth2 affected?
What is the CVSS score of CVE-2026-50627?
What CWE is associated with CVE-2026-50627?
How can I check Maven dependencies for CVE-2026-50627?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-9mrv-8pvf-hf4m",
"modified" : "2026-08-20T18:32:05Z",
"published" : "2026-06-12T12:31:33Z",
"aliases" : [ "CVE-2026-50627" ],
"summary" : "Apache CXF OAuth2 Missing JWT Audience and Issuer Validation in Access Token Validator",
"details" : "The JwtAccessTokenValidator class in Apache CXF fails to validate the 'aud' (Audience) claims of incoming JWT access tokens. This allows a JWT issued for one Resource Server to be successfully replayed against a completely different Resource Server, leading to Token Confusion/Routing attacks. 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:L/PR:H/UI:N/S:C/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.apache.cxf:cxf-rt-rs-security-oauth2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "4.2.0"
}, {
"fixed" : "4.2.2"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.apache.cxf:cxf-rt-rs-security-oauth2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "4.1.7"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50627"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:37390"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2026-50627"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2488298"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/apache/cxf"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread/0jfzz9q992957b99tw7hodcqjfyxwb1m"
}, {
"type" : "WEB",
"url" : "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50627.json"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2026/06/11/4"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-289", "CWE-303" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2026-08-20T18:32:04Z",
"nvd_published_at" : "2026-06-12T10:16:22Z"
}
}