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Full vulnerability report · 2026
CVE-2026-49875High confidence

Apache CXF: XML External Entity (XXE) Injection in W3CMultiSchemaFactory and EndpointReferenceUtils

Apache Software Foundation · Apache CXF

9.8CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.81% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Apache Software Foundation Apache CXF and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Open-source package ranges4 source-attributed ranges

These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
Mavenorg.apache.cxf:cxf-coreECOSYSTEM: introduced 4.2.0; fixed 4.2.24.2.2OSV record ↗aggregator derived · 2 Oct 2026
Mavenorg.apache.cxf:cxf-coreECOSYSTEM: introduced 0; fixed 4.1.74.1.7OSV record ↗aggregator derived · 2 Oct 2026
mavenorg.apache.cxf:cxf-core>= 4.2.0, < 4.2.24.2.2GitHub advisory ↗github reviewed aggregator · 2 Oct 2026
mavenorg.apache.cxf:cxf-core< 4.1.74.1.7GitHub advisory ↗github reviewed aggregator · 2 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-49875 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitycxf: org.apache.cxf/cxf-core: Apache CXF: Information disclosure via out-of-band external entity resolution due to missing JAXP hardening
5 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • cxf-core as a component of Red Hat build of Apache Camel 4 for Quarkus 3
  • cxf-core as a component of Red Hat Fuse 7
  • cxf-core as a component of Red Hat JBoss Enterprise Application Platform 7
  • cxf-core as a component of Red Hat JBoss Web Server 5
  • cxf-core as a component of Red Hat Single Sign-On 7
Summary
A flaw was found in Apache CXF. The EndpointReferenceUtils and W3CMultiSchemaFactory classes within Apache CXF construct a SAXParserFactory without proper security configurations. This oversight enables out-of-band (OOB) external entity resolution, a type of XML External Entity (XXE) vulnerability. A remote attacker could exploit this to disclose sensitive information from the affected system.
Remediation
Before applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-36394

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available
01

What, why and how

Apache CXF's EndpointReferenceUtils and W3CMultiSchemaFactory classes construct a SAXParserFactory without the necessary JAXP hardening configurations, enabling out-of-band (OOB) external entity resolution. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue.

What

Apache CXF's EndpointReferenceUtils and W3CMultiSchemaFactory classes construct a SAXParserFactory without the necessary JAXP hardening configurations, enabling out-of-band (OOB) external entity resolution. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue.

Why

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Apache CXF's EndpointReferenceUtils and W3CMultiSchemaFactory classes construct a SAXParserFactory without the necessary JAXP hardening configurations, enabling out-of-band (OOB) external entity resolution. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue.

Why

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Restriction of XML External Entity Reference → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-611 ↗

CWE-611: Improper Restriction of XML External Entity Reference. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-611
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-1895Apache CXF: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Apache CXF ausnutzen, um Sicherheitsvorkehrungen zu umgehen, XML-External-Entity-Angriffe durchzuführen, Daten zu manipulieren oder vertrauliche Informationen offenzulegen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1233Multiples vulnérabilités dans les produits IBM

ord?id=CVE-2026-47021 Référence CVE CVE-2026-47027 https://www.cve.org/CVERecord?id=CVE-2026-47027 Référence CVE CVE-2026-47057 https://www.cve.org/CVERecord?id=CVE-2026-47057 Référence CVE CVE-2026-47058 https://www.cve.org/CVERecord?id=CVE-2026-47058 Référence CVE CVE-2026-47059 https://www.cve.org/CVERecord?id=CVE-2026-47059 Référence CVE CVE-2026-47063 https://www.cve.org/CVERecord?id=CVE-2026-47063 Référence CVE CVE-2026-4873 https://www.cve.org/CVERecord?id=CVE-2026-4873 Référence CVE CVE-2026-48779 https://www.cve.org/CVERecord?id=CVE-2026-48779 Référence CVE CVE-2026-49356 https://www.cve.org/CVERecord?id=CVE-2026-49356 Référence CVE CVE-2026-49875 https://www.cve.org/CVERecord?id=CVE-2026-49875 Référence CVE CVE-2026-53550 https://www.cve.org/CVERecord?id=CVE-2026-53550 Référence CVE CVE-2026-53666 https://www.cve.org/CVERecord?id=CVE-2026-53666 Référence CVE CVE-2026-53668 https://www.cve.org/CVERecord?id=CVE-2026-53668 Référence CVE CVE-2026-53669 https://www.cve.org/CVERecord?id=CVE-2026-53669 Référence CVE CVE-2026-55602 https://www.cve.org/CVERecord?id=CVE-2026-55602 Référence CVE CVE-2026-55603 https://www.cve.org/CVERecord?id=CVE-2026-55603 Référence CVE CVE-2026-58059 https://www.cve.org/CVERecord?id=CVE-2026-58059 Référence CVE CVE-2026-58060 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-019834Apache Software FoundationのApache CXFにおけるXML 外部エンティティの脆弱性

Apache CXFのEndpointReferenceUtilsおよびW3CMultiSchemaFactoryクラスは、必要なJAXP強化設定なしにSAXParserFactoryを構築しており、その結果、アウトオブバンド（OOB）外部エンティティの解決が可能になっています。ユーザーはこの問題を修正したバージョン4.2.2または4.1.7にアップグレードすることを推奨します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
Before applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 12 Jun 2026 · Last source change 7 Aug 2026, 12:42 UTC · CWE-611 · Improper Restriction of XML External Entity Reference

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-36394
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    4.2.0 < 4.2.2; 4.0.0 < 4.1.7; < 3.6.12 · Fixed: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
    After
    4.2.0 < 4.2.2; 4.0.0 < 4.1.7; < 3.6.12 · Fixed: Before applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  2. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-49875 to remediation: access.redhat.com/CVE-2026-49875.
    Before
    remediation: access.redhat.com/CVE-2026-49875
    After
    remediation: access.redhat.com/CVE-2026-49875
    Red Hat Product Security ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    cxf-core as a component of Red Hat build of Apache Camel 4 for Quarkus 3; cxf-core as a component of Red Hat Fuse 7; cxf-core as a component of Red Hat JBoss Enterprise Application Platform 7; cxf-core as a component of Red Hat JBoss Enterprise Application Platform 8; cxf-core as a component of Red Hat JBoss Web Server 5; cxf-core as a component of Red Hat Single Sign-On 7 · Fixed: Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
    After
    cxf-core as a component of Red Hat build of Apache Camel 4 for Quarkus 3; cxf-core as a component of Red Hat Fuse 7; cxf-core as a component of Red Hat JBoss Enterprise Application Platform 7; cxf-core as a component of Red Hat JBoss Web Server 5; cxf-core as a component of Red Hat Single Sign-On 7 · Fixed: eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el10eap.src as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-cli-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-commons-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-core-client-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-dto-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-hornetq-protocol-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-hqclient-protocol-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-jakarta-client-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-jakarta-ra-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-jakarta-server-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-jakarta-service-extensions-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-jdbc-store-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-journal-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-selector-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-activemq-artemis-server-0:2.40.0-8.redhat_00024.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-apache-cxf-0:4.1.7-1.SP1_redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-apache-cxf-0:4.1.7-1.SP1_redhat_00001.1.el10eap.src as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-apache-cxf-rt-0:4.1.7-1.SP1_redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-apache-cxf-services-0:4.1.7-1.SP1_redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-apache-cxf-tools-0:4.1.7-1.SP1_redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-artemis-wildfly-integration-0:2.0.5-1.Final_redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-artemis-wildfly-integration-0:2.0.5-1.Final_redhat_00001.1.el10eap.src as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-bouncycastle-0:1.85.0-1.redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-bouncycastle-0:1.85.0-1.redhat_00001.1.el10eap.src as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-bouncycastle-jmail-0:1.85.0-1.redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-bouncycastle-pg-0:1.85.0-1.redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-bouncycastle-pkix-0:1.85.0-1.redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-bouncycastle-prov-0:1.85.0-1.redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; eap8-bouncycastle-util-0:1.85.0-1.redhat_00001.1.el10eap.noarch as a component of Red Hat JBoss EAP 8.1 for RHEL 10; and 414 more
    Red Hat Product Security ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    4.2.0 < 4.2.2; 4.0.0 < 4.1.7; < 3.6.12 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    4.2.0 < 4.2.2; 4.0.0 < 4.1.7; < 3.6.12 · Fixed: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  5. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-36394↗Red Hat Product Security security advisory↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-49875 · cve.blacktree.nl