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

[Colm O hEigeartaigh <coheigea () apache org>]

Severity: important 

Affected versions:

- Apache CXF (org.apache.cxf:cxf-rt-rs-security-oauth2) 4.2.0 before 4.2.2
- Apache CXF (org.apache.cxf:cxf-rt-rs-security-oauth2) before 4.1.7

Description:

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, which fixes this issue.

Credit:

Guanping Zhang reported this vulnerability (finder)

References:

https://cxf.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-50628