CVE-2026-34538Network attack vector

Authenticated XCom disclosure via missing endpoint permission check

Published Apr 9, 2026 · Updated Apr 9, 2026

Authorization bypass in Apache Airflow 3.0.0 through 3.1.8 allows remote authenticated users to read XCom results via DagRun wait. The wait_dag_run_until_finished route returns result-selected task XCom values after checking only DAG Run read permission, omitting FAB's separate XCom authorization. A Viewer-level account can retrieve sensitive execution results for readable DAGs without gaining write access or service control.

CVSS severity6.5
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Apache Airflow 3.0.0 through 3.1.8 allows remote authenticated users to read XCom results via DagRun wait. The wait_dag_run_until_finished route returns result-selected task XCom values after checking only DAG Run read permission, omitting FAB's separate XCom authorization. A Viewer-level account can retrieve sensitive execution results for readable DAGs without gaining write access or service control.

The record

CVE
CVE-2026-34538
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
The Apache Software Foundation
Product
Apache Airflow
Classifications
CWE-668, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 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=3.0.0 <3.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Airflowversion=3.0.0 <3.2.0

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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-668Exposure of Resource to Wrong Sphere
T1213Data from Information Repositories

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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