CVE-2026-75156: Apache Airflow FAB provider versions 3.7.3 through 3.8.0 do not validate the issuer or audience of Azure AD `i

This month

CRITICAL 9.1REMOTEWATCHLISTUPGRADE

CVE-2026-75156 is a critical-severity flaw (CVSS 9.1) affecting apache-airflow-providers-fab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache Airflow FAB provider versions 3.7.3 through 3.8.0 do not validate the issuer or audience of Azure AD `id_token`s during OAuth login. Deployments are affected only when the FAB auth manager is configured with Azure AD as an OAuth provider. Because the signing keys are fetched from Microsoft's **multi-tenant** JWKS endpoint, an `id_token` minted in *any* Azure tenant — including one the attacker creates — passes signature verification, and t

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-346
Published	2026-09-08
Last modified	2026-09-18

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 17:18 UTCPublished CVE record published
2026-09-18 14:25 UTCUpdated Record last modified

apache apache-airflow-providers-fab UPGRADE

Affected: >= 3.7.3 and < 3.8.1

Fixed in: 3.8.1

Safe to downgrade to: a release before 3.7.3

1. Check installed version

apt-cache policy apache-airflow-providers-fab || rpm -q apache-airflow-providers-fab || apache-airflow-providers-fab --version

2. UPGRADE to 3.8.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apache-airflow-providers-fab

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apache-airflow-providers-fab

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.7.3 (Debian / Ubuntu)

apt-cache madison apache-airflow-providers-fab sudo apt install apache-airflow-providers-fab=<VERSION_BEFORE_3.7.3> sudo apt-mark hold apache-airflow-providers-fab

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list apache-airflow-providers-fab sudo dnf downgrade apache-airflow-providers-fab-<VERSION_BEFORE_3.7.3> sudo dnf versionlock add apache-airflow-providers-fab

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-75156?

apache-airflow-providers-fab: upgrade to 3.8.1. Exact commands for each OS are on this page.

Is CVE-2026-75156 being exploited?

CVE-2026-75156 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-75156 affect?

CVE-2026-75156 affects apache-airflow-providers-fab. Severity is critical (CVSS 9.1). Apache Airflow FAB provider versions 3.7.3 through 3.8.0 do not validate the issuer or audience of Azure AD `id_token`s during OAuth login. Deployments are affected only when the FAB auth manager is configured with Azure AD as an OAuth prov

How urgent is CVE-2026-75156?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Azure vulnerabilities · Apache Airflow vulnerabilities

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References

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