---
title: "CVE-2026-49875: Apache CXF has Improper Restriction of XML External Entity Reference"
url: https://erroneo.us/security/cve/CVE-2026-49875/
description: "CVE-2026-49875 (org.apache.cxf:cxf-core (Maven)): Apache CXF's EndpointReferenceUtils and W3CMultiSchemaFactory classes construct a SAXParserFactory without…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-12
date_modified: 2026-10-02
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-49875"
kev: false
cvss: 7.5
epss: 0.00807
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-49875: Apache CXF has Improper Restriction of XML External Entity Reference

**Signal:** Normal patch cycle. No exploitation signal; fix it in your next routine update if you are affected. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.8% , percentile 56: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 56% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.apache.cxf:cxf-core (Maven) >= 4.2.0, < 4.2.2, fixed in 4.2.2 ; org.apache.cxf:cxf-core (Maven) < 4.1.7, fixed in 4.1.7 . Check your lockfile, including transitive dependencies.

## What it is

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

- Maven `org.apache.cxf:cxf-core` >= 4.2.0, < 4.2.2 → fixed: 4.2.2
- Maven `org.apache.cxf:cxf-core` < 4.1.7 → fixed: 4.1.7

## Affected products (CVE record)

- Apache Software Foundation Apache CXF: 4.2.0 < 4.2.2, 4.0.0 < 4.1.7, < 3.6.12

## Severity

- CISA-ADP CVSS 3.1: 6.5 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`
- redhat-SADP CVSS 3.1: 7.5 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.81% probability of exploitation activity in the next 30 days; percentile 56.

## Sources

- [lists.apache.org](https://lists.apache.org/thread/3kb9w5bg90xcp06fccoz9k3gpsvyy79o)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:36839)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:37390)
- [GitHub Advisory GHSA-xw5h-cmh3-8j6j](https://github.com/advisories/GHSA-xw5h-cmh3-8j6j)
- [CVE.org record CVE-2026-49875](https://www.cve.org/CVERecord?id=CVE-2026-49875)
- [NVD entry CVE-2026-49875](https://nvd.nist.gov/vuln/detail/CVE-2026-49875)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/06/11/2)
- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-49875)
- [RHBZ#2488309](https://bugzilla.redhat.com/show_bug.cgi?id=2488309)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49875.json)
- [cxf.apache.org](https://cxf.apache.org/security-advisories.data/CVE-2026-49875.txt)

---
Source page: https://erroneo.us/security/cve/CVE-2026-49875/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt