CVE-2026-50623 (GCVE-0-2026-50623)
Vulnerability from cvelistv5 – Published: 2026-06-12 08:52 – Updated: 2026-08-07 12:42
VLAI
EPSS
VEX
Title
Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService
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.
Severity
4.8 (Medium)
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
References
2 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed |
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-06-12T09:27:59.385Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2026/06/11/3"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-50623",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-13T03:55:33.556791Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-16T13:19:26.952Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected",
"packageName": "org.apache.cxf:cxf-rt-rs-security-oauth2",
"product": "Apache CXF",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "4.2.2",
"status": "affected",
"version": "4.2.0",
"versionType": "semver"
},
{
"lessThan": "4.1.7",
"status": "affected",
"version": "4.0.0",
"versionType": "semver"
},
{
"lessThan": "3.6.12",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Guanping Zhang reported this vulnerability."
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF.\u0026nbsp;Due 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.\u0026nbsp;Users are recommended to upgrade to version 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.\u003cbr\u003e\u003cbr\u003e"
}
],
"value": "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 or 3.6.12, which fixes this issue."
}
],
"metrics": [
{
"other": {
"content": {
"text": "moderate"
},
"type": "Textual description of severity"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-287",
"description": "CWE-287 Improper Authentication",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-07T12:42:50.769Z",
"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"shortName": "apache"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"assignerShortName": "apache",
"cveId": "CVE-2026-50623",
"datePublished": "2026-06-12T08:52:05.767Z",
"dateReserved": "2026-06-05T10:20:37.692Z",
"dateUpdated": "2026-08-07T12:42:50.769Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-50623",
"date": "2026-10-29",
"epss": "0.00369",
"percentile": "0.30804"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected",
"packageName": "org.apache.cxf:cxf-rt-rs-security-oauth2",
"product": "Apache CXF",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "4.2.2",
"status": "affected",
"version": "4.2.0",
"versionType": "semver"
},
{
"lessThan": "4.1.7",
"status": "affected",
"version": "4.0.0",
"versionType": "semver"
},
{
"lessThan": "3.6.12",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"source": "security@apache.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*",
"matchCriteriaId": "C0505632-D713-4EFC-B857-12EBD5C3DF33",
"versionEndExcluding": "4.1.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B1BF06FC-96AD-4663-9959-1B1493D4A2A0",
"versionEndExcluding": "4.2.2",
"versionStartIncluding": "4.2.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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 or 3.6.12, which fixes this issue."
},
{
"lang": "es",
"value": "Existe una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n en el servicio OAuth2 TokenIntrospectionService en Apache CXF. Debido a la ausencia de la palabra clave \u2019throw\u2019 en la verificaci\u00f3n del contexto de seguridad, el endpoint de introspecci\u00f3n (/services/oauth2/introspect) puede ser accedido por cualquier atacante de red no autenticado. Sin embargo, tenga en cuenta que esto es una salvaguarda solo en el caso de que alguien olvidara habilitar la autenticaci\u00f3n en el servicio. Se recomienda a los usuarios actualizar a la versi\u00f3n 4.2.2 o 4.1.7, que corrige este problema."
}
],
"id": "CVE-2026-50623",
"lastModified": "2026-10-25T23:10:00.167",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 2.5,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-50623",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-13T03:55:33.556791Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-06-12T10:16:22.467",
"references": [
{
"source": "security@apache.org",
"tags": [
"Vendor Advisory"
],
"url": "https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://www.openwall.com/lists/oss-security/2026/06/11/3"
}
],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-287"
}
],
"source": "security@apache.org",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-07T12:55:08+00:00",
"cve": "CVE-2026-50623",
"id": "CVE-2026-50623",
"initial_release_date": "2026-06-12T08:52:05.767000+00:00",
"product_status:known_not_affected": "4",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "org.apache.cxf/cxf-rt-rs-security-oauth2: Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50623.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-06-12T09:27:59.385Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2026/06/11/3"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-50623",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-13T03:55:33.556791Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-12T15:11:32.307Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected",
"packageName": "org.apache.cxf:cxf-rt-rs-security-oauth2",
"product": "Apache CXF",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "4.2.2",
"status": "affected",
"version": "4.2.0",
"versionType": "semver"
},
{
"lessThan": "4.1.7",
"status": "affected",
"version": "4.0.0",
"versionType": "semver"
},
{
"lessThan": "3.6.12",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Guanping Zhang reported this vulnerability."
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF.\u0026nbsp;Due 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.\u0026nbsp;Users are recommended to upgrade to version 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.\u003cbr\u003e\u003cbr\u003e"
}
],
"value": "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 or 3.6.12, which fixes this issue."
}
],
"metrics": [
{
"other": {
"content": {
"text": "moderate"
},
"type": "Textual description of severity"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-287",
"description": "CWE-287 Improper Authentication",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-07T12:42:50.769Z",
"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"shortName": "apache"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"assignerShortName": "apache",
"cveId": "CVE-2026-50623",
"datePublished": "2026-06-12T08:52:05.767Z",
"dateReserved": "2026-06-05T10:20:37.692Z",
"dateUpdated": "2026-08-07T12:42:50.769Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- 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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.