CVE-2026-59243Public exploitNetwork attack vector

Authentication bypass via unsigned Azure AD tokens

Published Jul 29, 2026 · Updated Jul 29, 2026

Improper JWT verification in Apache Airflow FAB provider before 3.7.3 allows remote attackers to assume arbitrary user identities. The _decode_and_validate_azure_jwt function decodes Azure AD ID tokens with signature verification disabled when the option is absent. Exposure requires the FAB auth manager, Azure AD OAuth, and an ID token reaching the callback; forged claims can grant the Admin role.

CVSS severity9.8
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

Improper JWT verification in Apache Airflow FAB provider before 3.7.3 allows remote attackers to assume arbitrary user identities. The _decode_and_validate_azure_jwt function decodes Azure AD ID tokens with signature verification disabled when the option is absent. Exposure requires the FAB auth manager, Azure AD OAuth, and an ID token reaching the callback; forged claims can grant the Admin role.

The record

CVE
CVE-2026-59243
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
The Apache Software Foundation
Product
Apache Airflow FAB provider
Classifications
CWE-347, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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 <3.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Airflow FAB providerversion=0 <3.7.3

Published CVSS scores

9.8CISA-ADPCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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