CVE-2026-50627Network attack vector

Cross-resource access via missing JWT audience validation

Published Jun 12, 2026 · Updated Jun 12, 2026

Authentication 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 authenticated users to replay JWTs. JwtAccessTokenValidator trusts an incoming JWT without comparing its aud claim with the receiving resource server, so a token scoped to one server is accepted by another. Exploitation requires a valid token issued for a different resource server and grants that token's privileges against the unintended service.

CVSS severity9.1
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication 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 authenticated users to replay JWTs. JwtAccessTokenValidator trusts an incoming JWT without comparing its aud claim with the receiving resource server, so a token scoped to one server is accepted by another. Exploitation requires a valid token issued for a different resource server and grants that token's privileges against the unintended service.

The record

CVE
CVE-2026-50627
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
The Apache Software Foundation
Product
Apache CXF
Classifications
CWE-303, CWE-289, T1550.001
Attack vector
network
Privileges
authenticated

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 privilegesauthenticated

What is affected?

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

Published CVSS scores

9.1NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
8.1Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-303Incorrect Implementation of Authentication Algorithm
CWE-289Authentication Bypass by Alternate Name
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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