CVE-2026-50628Network attack vector

OAuth2 authorization bypass via inverted IP comparison

Published Jun 12, 2026 · Updated Jun 12, 2026

IP-binding bypass in Apache CXF before 3.6.12, 4.0.0 through 4.1.6, and 4.2.0 through 4.2.1 allows remote attackers to reuse bound tokens. OAuthRequestFilter reverses the intended address comparison, rejecting the token's bound IP address while accepting every nonmatching source address. The flaw is reachable when token IP binding is enabled and a bound token is presented, granting that token's access to protected resources from another address.

CVSS severity9.8
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IP-binding bypass in Apache CXF before 3.6.12, 4.0.0 through 4.1.6, and 4.2.0 through 4.2.1 allows remote attackers to reuse bound tokens. OAuthRequestFilter reverses the intended address comparison, rejecting the token's bound IP address while accepting every nonmatching source address. The flaw is reachable when token IP binding is enabled and a bound token is presented, granting that token's access to protected resources from another address.

The record

CVE
CVE-2026-50628
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
The Apache Software Foundation
Product
Apache CXF
Classifications
CWE-20, CWE-358, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.1.7
  2. Affected versionversion=4.2.0 <4.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache CXFversion=0 <4.1.7; version=4.2.0 <4.2.2

Published CVSS scores

9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-358Improperly Implemented Security Check for Standard
T1550.001Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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