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CVE-2026-50623

Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

CVSS score

4.8

EPSS probability

%0.5

Risk score

0.0

Published

4 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-50623 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

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.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-50623 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1Apache Software FoundationApache CXF View
2apachecxf View
3apachecxf View
4mavenorg.apache.cxf:cxf-rt-rs-security-oauth2 View
5mavenorg.apache.cxf:cxf-rt-rs-security-oauth2 View
6mavenorg.apache.cxf:cxf-rt-rs-security-oauth2 View
Total affected vendors: 3|Products: 6

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
6.5CVSS 3.x—Vector not publishedGitHub Advisory
4.8CVSS V3_1MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NCVE ADP
4.8CVSS V31MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NNVD
0.0CVSS 4.0—Vector not publishedGitHub Advisory

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

osvorg.apache.cxf:cxf-rt-rs-security-oauth24.2.2

OSV düzeltilmiş sürüm: 4.2.2

osvorg.apache.cxf:cxf-rt-rs-security-oauth24.1.7

OSV düzeltilmiş sürüm: 4.1.7

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Apply the official update named in the evidence only to the matching product and version.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-50623 is associated with the following CWEs:

CWE-287: Improper Authentication

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-50623 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7vendor-advisoryhttp://www.openwall.com/lists/oss-security/2026/06/11/3nvdhttps://nvd.nist.gov/vuln/detail/CVE-2026-50623vendor-advisoryhttps://github.com/advisories/GHSA-542g-m3fx-q86fvendor-advisoryhttps://github.com/apache/cxfvendor-advisory

CVSS Vector Radar Chart

4.8 / 10
Attack VectorNetworkComplexityHighPrivilegesNoneUser Interact.NoneConfidentialityHighIntegrityNoneAvailabilityNone

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)High
Integrity (Bütünlük)None
Availability (Erişilebilirlik)None

Yama doğrulandı

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

AS
Apache Software Foundation logo
Apache Software Foundation
A
apache logo
apache
M
maven logo
maven

Weakness Type (CWE & CAPEC)

CWE-287

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