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Fencer Vulns
medium 4.8

CVE-2026-50623 json

Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

published 2026-06-12 4 mo ago modified 2026-11-05 4 d ago also GHSA-542g-m3fx-q86f , EUVD-2026-36393

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

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.

Patch / fix

  • maven org.apache.cxf:cxf-rt-rs-security-oauth2 4.1.7, 4.2.2
  • Apache Software Foundation Apache CXF 3.6.12, 4.1.7, 4.2.2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-50623 updated cvss 5.3

org.apache.cxf/cxf-rt-rs-security-oauth2: Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

  • Red Hat build of Apache Camel for Spring Boot 4 cxf-rt-rs-security-oauth2 Red Hat Fuse 7 cxf-rt-rs-security-oauth2 Red Hat JBoss Enterprise Application Platform Expansion Pack cxf-rt-rs-security-oauth2 Red Hat JBoss Web Server 5 cxf-rt-rs-security-oauth2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.cxf:cxf-rt-rs-security-oauth2
>=4.2.0, <4.2.2
<4.1.7
4.2.2
4.1.7

Affected products

  • Apache Software Foundation Apache CXF

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.