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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100CISA SSVC

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%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.6%
EPSS %ILE
49th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 29, 2026

Last Modified

September 16, 2026

Advisory Details (3)

Auto-updated Oct 8, 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

Pony Mail

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 15× in last 7d / 108× 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 392 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-07 04:13 UTCGHSA enrichment
  6. 2026-10-07 00:02 UTCEG score recompute
  7. 2026-10-07 00:02 UTCGHSA enrichment
  8. 2026-10-06 15:18 UTCEPSS rescore
  9. 2026-10-05 17:43 UTCEPSS rescore
  10. 2026-10-05 02:38 UTCEG score recompute
  11. 2026-10-05 02:38 UTCGHSA enrichment
  12. 2026-10-04 23:22 UTCEPSS rescore
  13. 2026-10-04 12:35 UTCGHSA enrichment
  14. 2026-10-04 07:05 UTCEG score recompute
  15. 2026-10-04 07:05 UTCGHSA enrichment
  16. 2026-10-03 14:26 UTCEPSS rescore
  17. 2026-10-03 03:11 UTCGHSA enrichment
  18. 2026-10-02 17:58 UTCEG score recompute
  19. 2026-10-02 17:58 UTCGHSA enrichment
  20. 2026-10-02 17:56 UTCEPSS rescore
  21. 2026-10-01 19:50 UTCEPSS rescore
  22. 2026-10-01 16:20 UTCGHSA enrichment
  23. 2026-10-01 12:12 UTCGHSA enrichment
  24. 2026-10-01 07:45 UTCGHSA enrichment
  25. 2026-10-01 03:37 UTCEG score recompute
Show 75 more
  1. 2026-10-01 03:37 UTCGHSA enrichment
  2. 2026-09-30 15:03 UTCEPSS rescore
  3. 2026-09-29 15:22 UTCEPSS rescore
  4. 2026-09-29 07:37 UTCEG score recompute
  5. 2026-09-29 07:37 UTCGHSA enrichment
  6. 2026-09-28 13:51 UTCEPSS rescore
  7. 2026-09-28 12:54 UTCGHSA enrichment
  8. 2026-09-28 07:29 UTCGHSA enrichment
  9. 2026-09-28 03:19 UTCEG score recompute
  10. 2026-09-28 03:19 UTCGHSA enrichment
  11. 2026-09-27 13:48 UTCEPSS rescore
  12. 2026-09-26 15:59 UTCEPSS rescore
  13. 2026-09-25 09:56 UTCGHSA enrichment
  14. 2026-09-25 05:47 UTCEG score recompute
  15. 2026-09-25 05:47 UTCGHSA enrichment
  16. 2026-09-24 14:04 UTCEPSS rescore
  17. 2026-09-24 10:24 UTCGHSA enrichment
  18. 2026-09-24 06:15 UTCGHSA enrichment
  19. 2026-09-24 02:00 UTCGHSA enrichment
  20. 2026-09-23 21:51 UTCEG score recompute
  21. 2026-09-23 21:51 UTCGHSA enrichment
  22. 2026-09-23 17:54 UTCEPSS rescore
  23. 2026-09-23 10:05 UTCGHSA enrichment
  24. 2026-09-23 05:55 UTCGHSA enrichment
  25. 2026-09-23 01:46 UTCGHSA enrichment
  26. 2026-09-22 21:37 UTCGHSA enrichment
  27. 2026-09-22 15:50 UTCEG score recompute
  28. 2026-09-22 15:50 UTCGHSA enrichment
  29. 2026-09-20 20:16 UTCEPSS rescore
  30. 2026-09-20 11:16 UTCGHSA enrichment
  31. 2026-09-20 04:34 UTCGHSA enrichment
  32. 2026-09-20 00:24 UTCEG score recompute
  33. 2026-09-20 00:24 UTCGHSA enrichment
  34. 2026-09-19 04:59 UTCGHSA enrichment
  35. 2026-09-19 00:05 UTCGHSA enrichment
  36. 2026-09-18 19:34 UTCEG score recompute
  37. 2026-09-18 19:34 UTCGHSA enrichment
  38. 2026-09-18 19:28 UTCEPSS rescore
  39. 2026-09-18 15:19 UTCGHSA enrichment
  40. 2026-09-18 10:06 UTCGHSA enrichment
  41. 2026-09-18 05:57 UTCGHSA enrichment
  42. 2026-09-18 01:46 UTCEG score recompute
  43. 2026-09-18 01:46 UTCGHSA enrichment
  44. 2026-09-17 19:31 UTCEPSS rescore
  45. 2026-09-17 10:25 UTCGHSA enrichment
  46. 2026-09-17 06:15 UTCGHSA enrichment
  47. 2026-09-17 01:37 UTCGHSA enrichment
  48. 2026-09-16 15:32 UTCGHSA enrichment
  49. 2026-09-16 15:06 UTCEG score recompute
  50. 2026-09-16 15:06 UTCGHSA enrichment
  51. 2026-09-16 14:08 UTCEPSS rescore
  52. 2026-09-16 11:49 UTCGHSA enrichment
  53. 2026-09-16 05:50 UTCEG score recompute
  54. 2026-09-16 05:49 UTCGHSA enrichment
  55. 2026-09-16 05:15 UTCEPSS rescore
  56. 2026-09-15 08:14 UTCEG score recompute
  57. 2026-09-15 08:14 UTCGHSA enrichment
  58. 2026-09-15 03:11 UTCEPSS rescore
  59. 2026-09-14 15:06 UTCGHSA enrichment
  60. 2026-09-14 10:50 UTCGHSA enrichment
  61. 2026-09-14 06:40 UTCGHSA enrichment
  62. 2026-09-14 02:31 UTCGHSA enrichment
  63. 2026-09-13 22:22 UTCGHSA enrichment
  64. 2026-09-13 18:14 UTCEG score recompute
  65. 2026-09-13 18:14 UTCGHSA enrichment
  66. 2026-09-13 16:47 UTCEPSS rescore
  67. 2026-09-13 14:05 UTCGHSA enrichment
  68. 2026-09-13 09:56 UTCGHSA enrichment
  69. 2026-09-13 05:45 UTCGHSA enrichment
  70. 2026-09-13 01:36 UTCGHSA enrichment
  71. 2026-09-12 21:27 UTCGHSA enrichment
  72. 2026-09-12 17:17 UTCEG score recompute
  73. 2026-09-12 17:17 UTCGHSA enrichment
  74. 2026-09-12 13:08 UTCGHSA enrichment
  75. 2026-09-12 08:59 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 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 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-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?
An upstream fix for CVE-2026-59243 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-59243 are linked in the Vendor Advisories panel on this page.

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