The fix for **CVE-2026-59243** was incomplete, and this advisory closes the remaining gap: that fix made the provider verify the `id_token` signature, but did not add issuer or audience checks. Operators who already applied the CVE-2026-59243 fix are **still affected and must upgrade again** — 3.7.3 is the release that shipped that fix, so every version containing it falls inside this affected range. Upgrade to apache-airflow-providers-fab `3.8.1` or later.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| Apache Software Foundation | Apache Airflow FAB provider | unaffected |
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No vendor fix or workaround currently provided.
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Tracking
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Tue, 08 Sep 2026 19:30:00 +0000
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cvssV3_1
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Tue, 08 Sep 2026 17:00:00 +0000
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| Description | 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 the username and role assignments are then read from that attacker-controlled token. Anyone able to register an Azure tenant can therefore authenticate to the Airflow UI with no prior access to the deployment. The fix for **CVE-2026-59243** was incomplete, and this advisory closes the remaining gap: that fix made the provider verify the `id_token` signature, but did not add issuer or audience checks. Operators who already applied the CVE-2026-59243 fix are **still affected and must upgrade again** — 3.7.3 is the release that shipped that fix, so every version containing it falls inside this affected range. Upgrade to apache-airflow-providers-fab `3.8.1` or later. | |
| Title | Apache Airflow FAB provider: FAB Azure AD OAuth: id_token issuer/audience not validated — cross-tenant authentication bypass | |
| Weaknesses | CWE-346 | |
| References |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-09-08T19:00:04.858Z
Reserved: 2026-08-17T18:58:02.812Z
Link: CVE-2026-75156
Vulnrichment
Updated: 2026-09-08T18:59:55.297Z
NVD
Status : Awaiting Analysis
Published: 2026-09-08T17:18:30.393
Modified: 2026-09-08T19:19:40.427
Link: CVE-2026-75156
Redhat
No data.
OpenCVE Enrichment
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CWE-346
Origin Validation Error