---
title: "CVE-2026-50628: Apache CXF OAuth2 has Inverted IP Binding Check that Defeats Security Control"
url: https://erroneo.us/security/cve/CVE-2026-50628/
description: "CVE-2026-50628 (org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven)): A logic error in OAuthRequestFilter rejects legitimate requests originating from the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-12
date_modified: 2026-08-20
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-50628"
kev: false
cvss: 7.4
epss: 0.01022
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-50628: Apache CXF OAuth2 has Inverted IP Binding Check that Defeats Security Control

**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 1.0% , percentile 63: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 63% 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-rt-rs-security-oauth2 (Maven) >= 4.2.0, < 4.2.2, fixed in 4.2.2 ; org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven) < 4.1.7, fixed in 4.1.7 . Check your lockfile, including transitive dependencies.

## What it is

A logic error in OAuthRequestFilter rejects legitimate requests originating from the bound IP address, while blindly allowing requests from any other IP address. Enabling this security feature inadvertently creates an inverse security check. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.

## Affected packages

- Maven `org.apache.cxf:cxf-rt-rs-security-oauth2` >= 4.2.0, < 4.2.2 → fixed: 4.2.2
- Maven `org.apache.cxf:cxf-rt-rs-security-oauth2` < 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: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- redhat-SADP CVSS 3.1: 7.4 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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 yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.02% probability of exploitation activity in the next 30 days; percentile 63.

## Sources

- [lists.apache.org](https://lists.apache.org/thread/vb3ho8lf228gh90m1fpnohf2008xrdxk)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:37390)
- [GitHub Advisory GHSA-g5v7-jchf-7jrr](https://github.com/advisories/GHSA-g5v7-jchf-7jrr)
- [CVE.org record CVE-2026-50628](https://www.cve.org/CVERecord?id=CVE-2026-50628)
- [NVD entry CVE-2026-50628](https://nvd.nist.gov/vuln/detail/CVE-2026-50628)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/06/11/5)
- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-50628)
- [RHBZ#2488302](https://bugzilla.redhat.com/show_bug.cgi?id=2488302)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50628.json)

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Source page: https://erroneo.us/security/cve/CVE-2026-50628/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt