CVE-2026-59243

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

July 29, 2026

Last Modified

September 16, 2026

Advisory Details (3)

Auto-updated Sep 16, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

oss-security - CVE-2026-59243: Apache Airflow FAB provider: FAB auth manager: JWT signature verification disabled by default for Azure AD OAuth (`verify_signature` defaults to `False`)

http://www.openwall.com/lists/oss-security/2026/07/28/10
generic
https://lists.apache.org/thread/x4784l7z00tl3gw4tv2dmvoon77rxgpl
github_pr

Verify Azure AD OAuth id_token signatures by default in FAB auth manager

Fix merged in apache/airflow PR #69374 on 2026-07-07 — awaiting tagged release

https://github.com/apache/airflow/pull/69374

Vendor Advisories for CVE-2026-59243(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 37× in last 7d / 153× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 334 total refreshes for this CVE.

  1. 2026-09-19 04:59 UTCGHSA enrichment
  2. 2026-09-19 00:05 UTCGHSA enrichment
  3. 2026-09-18 19:34 UTCEG score recompute
  4. 2026-09-18 19:34 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 15:19 UTCGHSA enrichment
  7. 2026-09-18 10:06 UTCGHSA enrichment
  8. 2026-09-18 05:57 UTCGHSA enrichment
  9. 2026-09-18 01:46 UTCEG score recompute
  10. 2026-09-18 01:46 UTCGHSA enrichment
  11. 2026-09-17 19:31 UTCEPSS rescore
  12. 2026-09-17 10:25 UTCGHSA enrichment
  13. 2026-09-17 06:15 UTCGHSA enrichment
  14. 2026-09-17 01:37 UTCGHSA enrichment
  15. 2026-09-16 15:32 UTCGHSA enrichment
  16. 2026-09-16 15:06 UTCEG score recompute
  17. 2026-09-16 15:06 UTCGHSA enrichment
  18. 2026-09-16 14:08 UTCEPSS rescore
  19. 2026-09-16 11:49 UTCGHSA enrichment
  20. 2026-09-16 05:50 UTCEG score recompute
  21. 2026-09-16 05:49 UTCGHSA enrichment
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-15 08:14 UTCEG score recompute
  24. 2026-09-15 08:14 UTCGHSA enrichment
  25. 2026-09-15 03:11 UTCEPSS rescore
Show 75 more
  1. 2026-09-14 15:06 UTCGHSA enrichment
  2. 2026-09-14 10:50 UTCGHSA enrichment
  3. 2026-09-14 06:40 UTCGHSA enrichment
  4. 2026-09-14 02:31 UTCGHSA enrichment
  5. 2026-09-13 22:22 UTCGHSA enrichment
  6. 2026-09-13 18:14 UTCEG score recompute
  7. 2026-09-13 18:14 UTCGHSA enrichment
  8. 2026-09-13 16:47 UTCEPSS rescore
  9. 2026-09-13 14:05 UTCGHSA enrichment
  10. 2026-09-13 09:56 UTCGHSA enrichment
  11. 2026-09-13 05:45 UTCGHSA enrichment
  12. 2026-09-13 01:36 UTCGHSA enrichment
  13. 2026-09-12 21:27 UTCGHSA enrichment
  14. 2026-09-12 17:17 UTCEG score recompute
  15. 2026-09-12 17:17 UTCGHSA enrichment
  16. 2026-09-12 13:08 UTCGHSA enrichment
  17. 2026-09-12 08:59 UTCGHSA enrichment
  18. 2026-09-12 04:49 UTCGHSA enrichment
  19. 2026-09-12 00:38 UTCGHSA enrichment
  20. 2026-09-11 19:22 UTCGHSA enrichment
  21. 2026-09-11 15:12 UTCEG score recompute
  22. 2026-09-11 15:12 UTCGHSA enrichment
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 06:37 UTCGHSA enrichment
  25. 2026-09-11 01:25 UTCGHSA enrichment
  26. 2026-09-10 19:56 UTCGHSA enrichment
  27. 2026-09-10 13:06 UTCEG score recompute
  28. 2026-09-10 13:05 UTCGHSA enrichment
  29. 2026-09-10 09:35 UTCEPSS rescore
  30. 2026-09-10 07:20 UTCGHSA enrichment
  31. 2026-09-09 12:02 UTCGHSA enrichment
  32. 2026-09-09 07:53 UTCEG score recompute
  33. 2026-09-09 07:53 UTCGHSA enrichment
  34. 2026-09-08 22:01 UTCEPSS rescore
  35. 2026-09-08 17:13 UTCGHSA enrichment
  36. 2026-09-08 01:02 UTCGHSA enrichment
  37. 2026-09-07 20:52 UTCEG score recompute
  38. 2026-09-07 20:52 UTCGHSA enrichment
  39. 2026-09-07 16:01 UTCEPSS rescore
  40. 2026-09-06 22:43 UTCGHSA enrichment
  41. 2026-09-06 15:53 UTCEG score recompute
  42. 2026-09-06 15:53 UTCGHSA enrichment
  43. 2026-09-06 13:47 UTCEPSS rescore
  44. 2026-09-06 11:44 UTCGHSA enrichment
  45. 2026-09-06 07:35 UTCGHSA enrichment
  46. 2026-09-06 03:26 UTCGHSA enrichment
  47. 2026-09-05 23:17 UTCGHSA enrichment
  48. 2026-09-05 19:07 UTCEG score recompute
  49. 2026-09-05 19:07 UTCGHSA enrichment
  50. 2026-09-05 09:30 UTCGHSA enrichment
  51. 2026-09-05 05:21 UTCGHSA enrichment
  52. 2026-09-04 16:17 UTCEG score recompute
  53. 2026-09-04 16:17 UTCGHSA enrichment
  54. 2026-09-04 11:57 UTCEG score recompute
  55. 2026-09-04 11:57 UTCGHSA enrichment
  56. 2026-09-04 05:07 UTCEPSS rescore
  57. 2026-09-02 14:12 UTCEPSS rescore
  58. 2026-09-01 22:48 UTCEG score recompute
  59. 2026-09-01 22:48 UTCGHSA enrichment
  60. 2026-09-01 13:54 UTCEPSS rescore
  61. 2026-09-01 04:40 UTCEPSS rescore
  62. 2026-09-01 00:39 UTCGHSA enrichment
  63. 2026-08-31 04:34 UTCGHSA enrichment
  64. 2026-08-31 00:25 UTCGHSA enrichment
  65. 2026-08-30 20:16 UTCEG score recompute
  66. 2026-08-30 20:16 UTCGHSA enrichment
  67. 2026-08-30 19:17 UTCEPSS rescore
  68. 2026-08-30 16:07 UTCGHSA enrichment
  69. 2026-08-30 11:58 UTCGHSA enrichment
  70. 2026-08-30 07:41 UTCGHSA enrichment
  71. 2026-08-30 03:32 UTCEG score recompute
  72. 2026-08-30 03:32 UTCGHSA enrichment
  73. 2026-08-30 01:22 UTCEPSS rescore
  74. 2026-08-29 23:23 UTCEG score recompute
  75. 2026-08-29 23:23 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59243?
CVE-2026-59243 is a critical vulnerability published on July 29, 2026. The FAB auth manager's Azure AD OAuth login defaulted verifysignature=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…
When was CVE-2026-59243 disclosed?
CVE-2026-59243 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59243 actively exploited?
CVE-2026-59243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.9% of all scored CVEs.
What is the CVSS score of CVE-2026-59243?
CVE-2026-59243 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-59243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59243, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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