CVE-2026-50628: Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control
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.
Security readout for executives and security teams
Apache CXF shipped an OAuth2 IP-binding feature that does the opposite of what it promises: it blocks the trusted IP and lets every other IP through. Organizations that enabled this protection thinking it hardened their APIs actually widened access. Upgrading to Apache CXF 4.2.2 or 4.1.7 corrects the check. Exposure is limited to deployments running Apache CXF 4.2.0–4.2.1 or 4.1.x prior to 4.1.7 that explicitly enable the OAuth2 IP-binding feature in OAuthRequestFilter. Public-facing OAuth2-protected APIs built on cxf-rt-rs-security-oauth2 are the highest concern, especially where operators believed IP binding was an active safeguard. Treat as high urgency for any team running Apache CXF OAuth2 with IP binding enabled: patch within the next change window and reconfirm compensating controls. If the feature is not used, prioritize on the normal patch cadence but do not enable IP binding until upgraded. Mitigation focus: Upgrade Apache CXF to 4.2.2 or 4.1.7 per the vendor advisory.; Apply Red Hat RHSA-2026:37390 updates on affected Red Hat products.; If patching is delayed, disable the OAuth2 IP-binding option rather than rely on it..
Prepared
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
Conservative CVE-to-ATT&CK context
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cwe · low confidence lookup
CWE-20: Exact CWE lookup
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2CVSS vectors
5Timeline events
3ADP providers
6Source links
SSVC decision data
CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total
CVSS vector scores
2 official scores
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CWE-20 · source CWE mapping
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improperly Implemented Security Check for Standard
Improperly Implemented Security Check for Standard represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.