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CVE-2026-50623 Apache Software Foundation CVE debrief

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, which fixes this issue.

Vendor
Apache Software Foundation
Product
Apache CXF
CVSS
MEDIUM 4.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-08-07
Advisory published
2026-06-12
Advisory updated
2026-08-07

Who should care

Users of Apache CXF with OAuth2 TokenIntrospectionService enabled, especially those who may have forgotten to enable authentication on the service.

Technical summary

The vulnerability has a CVSS score of 6.5 and is classified as MEDIUM severity. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N. The weakness is primarily categorized as CWE-287 (Improper Authentication) and NVD-CWE-noinfo.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to Apache CXF version 4.2.2 or 4.1.7
  • Ensure authentication is enabled on the OAuth2 TokenIntrospectionService

Evidence notes

The vulnerability was published on 2026-06-12T10:16:22.467Z and modified on 2026-06-12T19:07:52.217Z. The CVE record can be found at [cve-org]. More details are available at [nvd].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50623 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50623

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50623 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50623

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.