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Apache CXF has Improper Restriction of XML External Entity ReferenceGHSA-xw5h-cmh3-8j6j

CRITICAL

GHSA-xw5h-cmh3-8j6j is a critical-severity (CVSS 9.8) XML External Entity (XXE) vulnerability in org.apache.cxf:cxf-core. A fix is available for org.apache.cxf:cxf-core — see the affected versions and patch details below.

Also known asCVE-2026-49875
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-xw5h-cmh3-8j6j.

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs56th percentile — riskier than 56% of all scored CVEsHighest risk
0.00%0.44%0.87%1.31%0.5%0.5%0.5%0.8%0.8%Jul 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-xw5h-cmh3-8j6j by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected
☕org.apache.cxf:cxf-core☕org.apache.cxf:cxf-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.cxf:cxf-core≥ 4.2.0&&< 4.2.24.2.2org.apache.cxf:cxf-core:4.2.2
☕Mavenorg.apache.cxf:cxf-coreall versions4.1.7org.apache.cxf:cxf-core:4.1.7

Affected Products

1 product · 2 configurations
Application
cxfapache
≥ 4.2.0 && < 4.2.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.cxf:cxf-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.cxf:cxf-core to 4.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xw5h-cmh3-8j6j is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

This is an Important information disclosure vulnerability in Apache CXF, affecting Red Hat products that bundle the component, such as Enterprise Application Platform, JBoss Web Server, and Red Hat Single Sign-On. The flaw allows a remote attacker to disclose sensitive information due to improper XML parsing…

Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Source: Red Hat security advisory for GHSA-xw5h-cmh3-8j6j (CC BY 4.0)
ProductFixed inAdvisory
Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16cxf-coreRHSA-2026:37390
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el10eapRHSA-2026:70230
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el8eapRHSA-2026:70228
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el9eapRHSA-2026:70229

Frequently Asked Questions

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, which fix this issue.
O3 Security · Impact-Aware SCA

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