CVE-2026-76186 Apache Airflow Keycloak provider: Keycloak token cookies not bound to Airflow session identity
Attackers can pair their own Airflow session with another user's Keycloak tokens to gain unauthorized privileges, requiring the Keycloak auth manager.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76186?
CVE-2026-76186 is a critical authentication bypass vulnerability in Apache Airflow Keycloak provider, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Apache Airflow Keycloak provider: from Airflow 3.3 the Keycloak auth manager takes a user's identity from the signed Airflow session token but takes the Keycloak access and refresh tokens used for every authorization decision from separate, unauthenticated cookies, and never checks that the two describe the same subject. A user who holds any valid Airflow login of their own, together with another subject's Keycloak access or refresh token obtained out of band, can pair the two: Airflow then authorizes requests with the foreign token's privileges while the session identity, audit log and cache keys continue to name the attacker's own account. The refresh path re-issues an Airflow session token for the original identity carrying the foreign tokens, so the mismatched pairing survives across sessions.
Affects deployments running Airflow 3.3 or later with the Keycloak auth manager. Earlier versions carried the Keycloak tokens inside the signed session token, so the binding existed and was lost when they moved into separate cookies.
Users of apache-airflow-providers-keycloak are recommended to upgrade to version 0.10.0 or later, which binds the cookie-supplied tokens to the session identity.
Weakness: CWE-565
Which versions are affected by CVE-2026-76186?
It affects 1 product.
Products include Apache Apache-Airflow-Providers-Keycloak.
How do I fix CVE-2026-76186?
No fix has been published for CVE-2026-76186 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-76186 being exploited?
There is no known exploitation of CVE-2026-76186 in the wild and no public exploit code.
Other vulnerabilities in Apache Airflow Keycloak provider
Sources
Also known as GHSA-xhp3-rrf4-c8rv.