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TI-2026-37316 Aliases CVE-2026-50623GHSA-542g-m3fx-q86f

Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

Priority LOW 24CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint (/services/oauth2/introspect) can be accessed by any unauthenticated network attacker. However note that this is a safeguard only in the case that someone forgot to enable authentication on the service. Users are recommended to upgrade to version 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00369 31st percentileScored 2026-11-07
Fix Fixed Apache CXF (Apache Software Foundation): 4.2.2, 4.1.7, 3.6.12org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven): 4.2.2, 4.1.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache CXF4.2.0 to before 4.2.2; 4.0.0 to before 4.1.7; before 3.6.124.2.2, 4.1.7, 3.6.12Patch availableCNA
—org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven)4.2.0 to before 4.2.24.2.2Patch availableGHSA-542g-m3fx-q86f
—org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven)before 4.1.74.1.7Patch availableGHSA-542g-m3fx-q86f
  • Apache CXF VendorApache Affected 4.2.0 to before 4.2.2; 4.0.0 to before 4.1.7; before 3.6.12 Fixed in 4.2.2, 4.1.7, 3.6.12 Patch available CNA
  • org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven) Vendor— Affected 4.2.0 to before 4.2.2 Fixed in 4.2.2 Patch available GHSA-542g-m3fx-q86f
  • org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven) Vendor— Affected before 4.1.7 Fixed in 4.1.7 Patch available GHSA-542g-m3fx-q86f

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*before 3.6.12; 4.0.0 to before 4.1.7; 4.2.0 to before 4.2.2VulnerableApache
  • cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:* Versions before 3.6.12; 4.0.0 to before 4.1.7; 4.2.0 to before 4.2.2 Vulnerable ·Apache

Remediation

  • Fix · CNA Apache CXF (Apache Software Foundation) Fixed in 4.2.2, 4.1.7, 3.6.12
  • Fix · GHSA-542g-m3fx-q86f org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven) Fixed in 4.2.2 Advisory →
  • Fix · GHSA-542g-m3fx-q86f org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven) Fixed in 4.1.7 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Apache CXF 3.6.12, 4.1.7, 4.2.2

    11 records Highest priority Priority MEDIUM 3 MEDIUM, 8 LOW

    Other records, highest priority first

    • TI-2026-37318 Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security ControlPriority MEDIUM 50
    • TI-2026-37317 Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token ValidatorPriority MEDIUM 48
    • TI-2026-36773 Apache CXF: XML External Entity (XXE) Injection in W3CMultiSchemaFactory and EndpointReferenceUtilsPriority MEDIUM 43
    Show all 11 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 4 products
  • Red Hat Fuse 7
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat JBoss Web Server 5
  • Red Hat build of Apache Camel for Spring Boot 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-50623
  2. 2026-10-03 Alias added: GHSA-542g-m3fx-q86f

References

Advisory 3

Other 1

  • TI-2019-09264 Incorrect authorization in Apache CXF CVSS 3.1CRITICAL 9.8
  • TI-2020-10930 Apache CXF Reflected XSS in the services listing page via the styleSheetPath CVSS 3.1MEDIUM 6.1
  • TI-2010-01990 Apache CXF 2.0.x before 2.0.13, 2.1.x before 2.1.10, and 2.2.x before 2.2.9, as used in… CVSS 3.1CRITICAL 9.8
  • TI-2022-22907 Apache CXF SSRF Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-47481 Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage CVSS 3.1CRITICAL 9.8
  • TI-2025-31053 Apache CXF: Untrusted JMS configuration can lead to RCE CVSS 3.1CRITICAL 9.8
See all 79 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences