CVE-2026-59243

criticalpriority · track · 10EPSS 0.006 · 51 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · PoC

Likely / severe?

0.64% (51st) EPSS

CVSS 9.8 · critical

Is it mine?

5 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one holding the Admin role (CWE-347). Deployments running the FAB auth manager with the Azure AD OAuth login path under its default configuration are affected; the Authentik path already defaulted to `True`. This issue affects `apache-airflow-providers-fab` before 3.7.3. Users are advised to upgrade to `apache-airflow-providers-fab` 3.7.3, which defaults `verify_signature=True`.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-347USCWE-347US

exploits (2)

Public proof-of-concept and weaponised exploit code.

0xdak/CVE-2026-59243_exploit0xdak/CVE-2026-59243_exploitPoC · poc_in_github
MalHyuk/CVE-2026-59243CVE-2026-59243 — Apache Airflow FAB Auth Manager JWT signature bypass (embargoed until Apache advisory)PoC · poc_in_github

affected products (5)

Products and version ranges known to be affected.

Apache Airflow FAB provider <3.7.3all versionscert_bundDE
Apache Airflow≤ FAB provider <3.7.3cert_bundDE
Apache Software Foundation Apache Airflow Fab Provider0 → 3.7.3enisa_euvdEU
Apache Software Foundation Airflow Fab Provider≤ 3.7.3fstec_bduRU
apache apache-airflow-providers-fab< 3.7.3nvdUScpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2551Apache Airflow FAB provider: Schwachstelle ermöglicht Erlangen von AdministratorrechtenDeutsch2026-07-27csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Apache Airflow FAB provider ausnutzen, um Sicherheitsmaßnahmen zu umgehen und Administratorrechte zu erlangen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2026-07-29modified 2026-10-23

references (8)

External citations — patches, advisories, analysis.

scry

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