---
id: CVE-2026-86473
title: >-
  Apache Airflow: the Core API logout endpoint revokes only a session token
  presented as the _token cookie
summary: >-
  Apache Airflow: the Core API logout endpoint revokes only a session token
  presented as the _token cookie. When a client logs out presenting its
  credential as an Authorization bearer header instead, the endpoint returns its
  normal logout …
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-613
vendor: apache
product: airflow
affected:
  - 'airflow >= 3.0.0, < 3.3.2'
patched:
  - airflow 3.3.2
published: '2026-09-21'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T13:53:06.273'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86473'
references:
  - url: 'https://github.com/apache/airflow/pull/72649'
    label: security@apache.org
  - url: 'https://lists.apache.org/thread/k9z1p0q1ng8m68nlnv9d1fqzscrfm7vr'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/21/5'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
  - osv
  - pip
epss: 0.00747
epssPercentile: 0.54988
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-21T18:41:03.098800Z'
ingestedAt: '2026-09-21T14:38:56.365Z'
aliases:
  - PYSEC-2026-3990
  - BIT-airflow-2026-86473
ecosystem: pip
---

## Overview

Apache Airflow: the Core API logout endpoint revokes only a session token presented as the _token cookie. When a client logs out presenting its credential as an Authorization bearer header instead, the endpoint returns its normal logout response but revokes nothing, so the token remains valid until it expires. An attacker who already holds a copy of that token keeps the victim's access after the victim has logged out and believes the session ended; the default token lifetime is 24 hours and is configurable.

Affects API clients that authenticate with a bearer token rather than the browser session cookie. The attacker must already possess a copy of a valid token; obtaining one is outside the scope of this issue, and no privileges beyond the victim's own are gained.

Users of apache-airflow are recommended to upgrade to apache-airflow version 3.3.2 or later, which fixes the issue.

## Affected

- `airflow >= 3.0.0, < 3.3.2`

## Remediation

Upgrade past the affected range:

- `airflow 3.3.2`

## Package advisory (CVE-2026-86473)

Affected packages:

- `apache-airflow >= 3.0.0, < 3.3.2`

Patched in:

- `apache-airflow 3.3.2`

Source: https://osv.dev/vulnerability/PYSEC-2026-3990