CVE-2026-50629: Cxf rt rs security oauth2 Apache CXF OAuth2 Log Injection Vulnerability

HIGH
Advisory Identifier: GHSA-f8p7-h97q-7vx7
Share
CVSS 8.2
CWE-93
Published
Advisory Summary

CVE-2026-50629 is a HIGH (CVSS 8.2) apache cxf oauth2 log injection vulnerability (CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')) affecting Cxf rt rs security oauth2 libraries in the Maven ecosystem. The issue involves apache cxf oauth2 log injection via unsanitized client identifier. Remediation is available by upgrading affected packages to version 4.2.2, 4.1.7.

CVE-2026-50629 at a Glance

CVE Identifier CVE-2026-50629
GHSA Identifier GHSA-f8p7-h97q-7vx7
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Affected Product Cxf rt rs security oauth2
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.2

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

How to Fix CVE-2026-50629

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-2026-50629, 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-93: Improper Neutralization of CRLF Sequences ('CRLF Injection'), where the product uses crlf (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes crlf sequences from inputs. 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

The 'clientId' parameter from incoming HTTP requests is directly concatenated into OAuth2 server log warning messages without sanitizing control characters. This allows an attacker to inject arbitrary content, including fake log entries, into the server's log files. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.

CVE-2026-50629 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-2026-50629 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50629
Cxf rt rs security oauth2 Source Repository REPOSITORY
https://github.com/apache/cxf
lists.apache.org/thread/xw95po30p8th... WEB
https://lists.apache.org/thread/xw95po30p8th58ms1no6b0f2375cql00
Cxf rt rs security oauth2 Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/06/11/6

Frequently Asked Questions

What is CVE-2026-50629?
CVE-2026-50629 is a security vulnerability in Cxf rt rs security oauth2 involving Apache CXF OAuth2 Log Injection via Unsanitized Client Identifier under CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection').
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-2026-50629?
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-2026-50629?
CVE-2026-50629 has a CVSS v3.1 base score of 8.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
What CWE is associated with CVE-2026-50629?
CVE-2026-50629 is classified under CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') (The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.).
How can I check Maven dependencies for CVE-2026-50629?
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-f8p7-h97q-7vx7",
  "modified" : "2026-08-20T18:31:33Z",
  "published" : "2026-06-12T12:31:33Z",
  "aliases" : [ "CVE-2026-50629" ],
  "summary" : "Apache CXF OAuth2 Log Injection via Unsanitized Client Identifier",
  "details" : "The 'clientId' parameter from incoming HTTP requests is directly concatenated into OAuth2 server log warning messages without sanitizing control characters. This allows an attacker to inject arbitrary content, including fake log entries, into the server's log files. 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:N/UI:N/S:U/C:H/I:L/A:N"
  } ],
  "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-2026-50629"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/cxf"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/xw95po30p8th58ms1no6b0f2375cql00"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/06/11/6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-93" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-20T18:31:33Z",
    "nvd_published_at" : "2026-06-12T10:16:22Z"
  }
}