Vulnerability-Lookup

GHSA-542G-M3FX-Q86F

Vulnerability from github – Published: 2026-06-12 12:31 – Updated: 2026-08-20 18:31

Summary

Apache CXF has Authentication Bypass in OAuth2 TokenIntrospectionService

Details

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.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.cxf:cxf-rt-rs-security-oauth2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0"
            },
            {
              "fixed": "4.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.cxf:cxf-rt-rs-security-oauth2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-50623"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-20T18:31:09Z",
    "nvd_published_at": "2026-06-12T10:16:22Z",
    "severity": "MODERATE"
  },
  "details": "An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF.\u00a0Due to a missing \u0027throw\u0027 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.\u00a0Users are recommended to upgrade to version 4.2.2 or 4.1.7, which fixes this issue.",
  "id": "GHSA-542g-m3fx-q86f",
  "modified": "2026-08-20T18:31:09Z",
  "published": "2026-06-12T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50623"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/cxf"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/11/3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache CXF has Authentication Bypass in OAuth2 TokenIntrospectionService"
}

CVE-2026-50623 (GCVE-0-2026-50623)

Vulnerability from cvelistv5 – Published: 2026-06-12 08:52 – Updated: 2026-08-07 12:42

Title

Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

Summary

Severity

4.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-13 03:55 UTC

CWE

CWE-287 - Improper Authentication

Assigner

apache mitre root

References

2 references

URL	Tags
https://lists.apache.org/thread/ydzj8m5mqmjy13xgy…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/06/11/3

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache CXF	Affected: 4.2.0 , < 4.2.2 (semver) Affected: 4.0.0 , < 4.1.7 (semver) Affected: 0 , < 3.6.12 (semver)

Credits

Guanping Zhang reported this vulnerability.

Show details on NVD website

JSON

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        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/06/11/3"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
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              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 4.8,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
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              "userInteraction": "NONE",
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-13T03:55:33.556791Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-06-16T13:19:26.952Z",
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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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GHSA-542G-M3FX-Q86F

CVE-2026-50623 (GCVE-0-2026-50623)

Tags

Sightings

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