CVE-2026-59243

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH 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(high)
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
37%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 5, 2026

Advisory Details (3)

Auto-updated Aug 19, 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 51× in last 7d / 223× 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 223 total refreshes for this CVE.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-26 12:48 UTCGHSA enrichment
  3. 2026-08-26 08:39 UTCGHSA enrichment
  4. 2026-08-26 04:25 UTCGHSA enrichment
  5. 2026-08-25 23:54 UTCGHSA enrichment
  6. 2026-08-25 19:45 UTCGHSA enrichment
  7. 2026-08-25 15:36 UTCEG score recompute
  8. 2026-08-25 15:36 UTCGHSA enrichment
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-25 11:17 UTCGHSA enrichment
  11. 2026-08-25 07:07 UTCGHSA enrichment
  12. 2026-08-25 02:58 UTCGHSA enrichment
  13. 2026-08-24 22:48 UTCGHSA enrichment
  14. 2026-08-24 18:39 UTCGHSA enrichment
  15. 2026-08-24 14:31 UTCEG score recompute
  16. 2026-08-24 14:31 UTCGHSA enrichment
  17. 2026-08-24 10:22 UTCEG score recompute
  18. 2026-08-24 10:22 UTCGHSA enrichment
  19. 2026-08-24 06:13 UTCGHSA enrichment
  20. 2026-08-24 01:45 UTCGHSA enrichment
  21. 2026-08-23 21:34 UTCGHSA enrichment
  22. 2026-08-23 17:26 UTCGHSA enrichment
  23. 2026-08-23 13:17 UTCGHSA enrichment
  24. 2026-08-23 09:08 UTCGHSA enrichment
  25. 2026-08-23 05:00 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 00:51 UTCEG score recompute
  2. 2026-08-23 00:51 UTCGHSA enrichment
  3. 2026-08-23 00:19 UTCEPSS rescore
  4. 2026-08-22 20:42 UTCGHSA enrichment
  5. 2026-08-22 16:33 UTCGHSA enrichment
  6. 2026-08-22 12:23 UTCGHSA enrichment
  7. 2026-08-22 08:14 UTCGHSA enrichment
  8. 2026-08-22 04:05 UTCGHSA enrichment
  9. 2026-08-21 23:55 UTCEG score recompute
  10. 2026-08-21 23:55 UTCGHSA enrichment
  11. 2026-08-21 23:49 UTCEPSS rescore
  12. 2026-08-21 19:46 UTCGHSA enrichment
  13. 2026-08-21 15:38 UTCGHSA enrichment
  14. 2026-08-21 11:28 UTCGHSA enrichment
  15. 2026-08-21 07:02 UTCGHSA enrichment
  16. 2026-08-21 02:52 UTCEG score recompute
  17. 2026-08-21 02:52 UTCGHSA enrichment
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-20 22:43 UTCGHSA enrichment
  20. 2026-08-20 18:34 UTCGHSA enrichment
  21. 2026-08-20 14:26 UTCGHSA enrichment
  22. 2026-08-20 08:40 UTCGHSA enrichment
  23. 2026-08-20 04:32 UTCGHSA enrichment
  24. 2026-08-20 00:23 UTCGHSA enrichment
  25. 2026-08-19 20:14 UTCEG score recompute
  26. 2026-08-19 20:14 UTCGHSA enrichment
  27. 2026-08-19 17:04 UTCEPSS rescore
  28. 2026-08-19 16:00 UTCGHSA enrichment
  29. 2026-08-19 11:50 UTCGHSA enrichment
  30. 2026-08-19 07:41 UTCGHSA enrichment
  31. 2026-08-19 03:33 UTCGHSA enrichment
  32. 2026-08-18 22:48 UTCGHSA enrichment
  33. 2026-08-18 18:37 UTCEG score recompute
  34. 2026-08-18 18:36 UTCGHSA enrichment
  35. 2026-08-18 13:48 UTCEPSS rescore
  36. 2026-08-18 09:41 UTCGHSA enrichment
  37. 2026-08-18 05:32 UTCGHSA enrichment
  38. 2026-08-18 01:22 UTCGHSA enrichment
  39. 2026-08-17 21:14 UTCGHSA enrichment
  40. 2026-08-17 17:05 UTCEG score recompute
  41. 2026-08-17 17:05 UTCGHSA enrichment
  42. 2026-08-17 13:47 UTCEPSS rescore
  43. 2026-08-17 12:55 UTCGHSA enrichment
  44. 2026-08-17 08:46 UTCGHSA enrichment
  45. 2026-08-17 04:38 UTCGHSA enrichment
  46. 2026-08-17 00:29 UTCGHSA enrichment
  47. 2026-08-16 20:20 UTCGHSA enrichment
  48. 2026-08-16 16:11 UTCEG score recompute
  49. 2026-08-16 16:11 UTCGHSA enrichment
  50. 2026-08-16 14:56 UTCEPSS rescore
  51. 2026-08-16 12:02 UTCGHSA enrichment
  52. 2026-08-16 07:53 UTCGHSA enrichment
  53. 2026-08-16 03:45 UTCEG score recompute
  54. 2026-08-16 03:45 UTCGHSA enrichment
  55. 2026-08-16 02:14 UTCEPSS rescore
  56. 2026-08-15 23:36 UTCGHSA enrichment
  57. 2026-08-15 19:27 UTCGHSA enrichment
  58. 2026-08-15 15:18 UTCGHSA enrichment
  59. 2026-08-15 11:09 UTCGHSA enrichment
  60. 2026-08-15 07:00 UTCGHSA enrichment
  61. 2026-08-15 02:49 UTCEG score recompute
  62. 2026-08-15 02:49 UTCGHSA enrichment
  63. 2026-08-15 01:30 UTCEPSS rescore
  64. 2026-08-14 22:40 UTCGHSA enrichment
  65. 2026-08-14 18:32 UTCGHSA enrichment
  66. 2026-08-14 14:23 UTCGHSA enrichment
  67. 2026-08-14 10:15 UTCGHSA enrichment
  68. 2026-08-14 06:06 UTCGHSA enrichment
  69. 2026-08-14 01:58 UTCEG score recompute
  70. 2026-08-14 01:58 UTCGHSA enrichment
  71. 2026-08-13 22:00 UTCEPSS rescore
  72. 2026-08-13 21:49 UTCGHSA enrichment
  73. 2026-08-13 17:40 UTCGHSA enrichment
  74. 2026-08-13 13:20 UTCGHSA enrichment
  75. 2026-08-13 09:12 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 August 5, 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 63.0% 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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