apache-airflow-providers-keycloak: Missing OAuth 2.0 State and PKCE Enables Login CSRF and Session Fixation

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.4 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS

• CVE-2026-40948: 0.40% estimated exploitation activity in the next 30 days; percentile 34.70 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The Keycloak authentication manager in apache-airflow-providers-keycloak did not generate or validate the OAuth 2.0 state parameter on the login / login-callback flow, and did not use PKCE. An attacker with a Keycloak account in the same realm could deliver a crafted callback URL to a victim's browser and cause the victim to be logged into the attacker's Airflow session (login-CSRF / session fixation), where any credentials the victim subsequently stored in Airflow Connections would be harvestable by the attacker. Users are advised to upgrade apache-airflow-providers-keycloak to 0.7.0 or later.

Published by the source

18 Apr 2026, 15:34 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:40 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-5w6h-pjw6-wvc6

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-5w6h-pjw6-wvc6

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# Patch Next advisory brief: CVE-2026-40948

Advisory: apache-airflow-providers-keycloak: Missing OAuth 2.0 State and PKCE Enables Login CSRF and Session Fixation
IDs: CVE-2026-40948, GHSA-5w6h-pjw6-wvc6
Record: https://patchnext.com/advisories/cve-2026-40948 (revision 2, source checked 26 Oct 2026, 13:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: apache-airflow-providers-keycloak 0.7.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI apache-airflow-providers-keycloak: affected >= 0.0.1, < 0.7.0; fixed in 0.7.0

## Suggested inspection (read-only)
- `python -m pip show apache-airflow-providers-keycloak`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on apache-airflow-providers-keycloak.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-5w6h-pjw6-wvc6 (OSV record GHSA-5w6h-pjw6-wvc6 lists affected ranges: PyPI apache-airflow-providers-keycloak >=0.0.1 <0.7.0 (fixed))
- Verified: https://github.com/advisories/GHSA-5w6h-pjw6-wvc6 (GitHub-reviewed advisory GHSA-5w6h-pjw6-wvc6 lists affected ranges: PyPI apache-airflow-providers-keycloak >=0.0.1 <0.7.0)

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