CVE-2026-33843

CRITICALNVD 9.89.1▼
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-26. the CNA's CVSS baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

Authentication bypass using an alternate path or channel in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.

CVSS v3
9.8
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
38.2%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated May 28, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33843

Vendor Advisories for CVE-2026-33843(2)

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 10× in last 7d / 78× 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 315 total refreshes for this CVE.

  1. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 11:51 UTCNVD updateCVSS v3 → 9.8
  4. 2026-07-23 03:09 UTCEG score recompute
  5. 2026-07-22 14:08 UTCEPSS rescore
  6. 2026-07-21 15:24 UTCEPSS rescore
  7. 2026-07-20 17:08 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 02:29 UTCEPSS rescore
  10. 2026-07-18 10:04 UTCEPSS rescore
  11. 2026-07-16 17:03 UTCEPSS rescore
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 02:00 UTCEPSS rescore
  15. 2026-07-13 22:30 UTCEPSS rescore
  16. 2026-07-13 06:13 UTCEPSS rescore
  17. 2026-07-13 06:13 UTCEPSS rescore
  18. 2026-07-12 05:46 UTCEPSS rescore
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-09 19:10 UTCEPSS rescore
  21. 2026-07-08 15:15 UTCEPSS rescore
  22. 2026-07-07 13:46 UTCEPSS rescore
  23. 2026-07-06 16:27 UTCEPSS rescore
  24. 2026-07-06 16:27 UTCEPSS rescore
  25. 2026-07-06 02:23 UTCEPSS rescore
Show 75 more
  1. 2026-07-06 02:23 UTCEPSS rescore
  2. 2026-07-05 02:30 UTCEPSS rescore
  3. 2026-07-04 06:31 UTCEPSS rescore
  4. 2026-07-01 15:06 UTCEPSS rescore
  5. 2026-07-01 14:22 UTCVendor advisory
  6. 2026-07-01 14:22 UTCGHSA enrichment
  7. 2026-06-30 23:22 UTCEPSS rescore
  8. 2026-06-29 19:53 UTCVendor advisory
  9. 2026-06-29 19:53 UTCGHSA enrichment
  10. 2026-06-29 15:03 UTCVendor advisory
  11. 2026-06-29 15:03 UTCGHSA enrichment
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-29 14:06 UTCEPSS rescore
  14. 2026-06-29 00:49 UTCVendor advisory
  15. 2026-06-29 00:49 UTCGHSA enrichment
  16. 2026-06-28 14:07 UTCEPSS rescore
  17. 2026-06-28 14:07 UTCEPSS rescore
  18. 2026-06-28 11:34 UTCVendor advisory
  19. 2026-06-28 11:34 UTCGHSA enrichment
  20. 2026-06-28 07:36 UTCVendor advisory
  21. 2026-06-28 07:36 UTCGHSA enrichment
  22. 2026-06-28 04:56 UTCEPSS rescore
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-28 03:20 UTCVendor advisory
  25. 2026-06-28 03:20 UTCGHSA enrichment
  26. 2026-06-27 23:21 UTCVendor advisory
  27. 2026-06-27 23:21 UTCGHSA enrichment
  28. 2026-06-27 19:22 UTCVendor advisory
  29. 2026-06-27 19:22 UTCGHSA enrichment
  30. 2026-06-27 15:23 UTCVendor advisory
  31. 2026-06-27 15:23 UTCGHSA enrichment
  32. 2026-06-27 11:11 UTCVendor advisory
  33. 2026-06-27 11:11 UTCGHSA enrichment
  34. 2026-06-27 07:08 UTCVendor advisory
  35. 2026-06-27 07:08 UTCGHSA enrichment
  36. 2026-06-27 03:08 UTCEPSS rescore
  37. 2026-06-26 22:28 UTCVendor advisory
  38. 2026-06-26 22:28 UTCGHSA enrichment
  39. 2026-06-26 18:28 UTCVendor advisory
  40. 2026-06-26 18:28 UTCGHSA enrichment
  41. 2026-06-26 02:52 UTCVendor advisory
  42. 2026-06-26 02:52 UTCGHSA enrichment
  43. 2026-06-25 20:19 UTCVendor advisory
  44. 2026-06-25 20:19 UTCGHSA enrichment
  45. 2026-06-25 16:14 UTCVendor advisory
  46. 2026-06-25 16:14 UTCGHSA enrichment
  47. 2026-06-25 13:49 UTCEPSS rescore
  48. 2026-06-25 13:49 UTCEPSS rescore
  49. 2026-06-25 12:13 UTCVendor advisory
  50. 2026-06-25 12:13 UTCGHSA enrichment
  51. 2026-06-24 14:05 UTCEPSS rescore
  52. 2026-06-23 21:33 UTCEPSS rescore
  53. 2026-06-23 21:33 UTCEPSS rescore
  54. 2026-06-22 14:25 UTCEPSS rescore
  55. 2026-06-22 14:25 UTCEPSS rescore
  56. 2026-06-21 14:56 UTCEPSS rescore
  57. 2026-06-21 14:56 UTCEPSS rescore
  58. 2026-06-21 01:59 UTCEPSS rescore
  59. 2026-06-19 19:25 UTCEPSS rescore
  60. 2026-06-19 19:25 UTCEPSS rescore
  61. 2026-06-18 17:52 UTCEPSS rescore
  62. 2026-06-18 17:52 UTCEPSS rescore
  63. 2026-06-18 03:41 UTCGHSA enrichment
  64. 2026-06-17 23:39 UTCGHSA enrichment
  65. 2026-06-17 19:23 UTCGHSA enrichment
  66. 2026-06-17 17:53 UTCEPSS rescore
  67. 2026-06-17 13:57 UTCGHSA enrichment
  68. 2026-06-17 09:57 UTCGHSA enrichment
  69. 2026-06-17 05:20 UTCGHSA enrichment
  70. 2026-06-17 01:21 UTCGHSA enrichment
  71. 2026-06-16 21:22 UTCVendor advisory
  72. 2026-06-16 21:22 UTCGHSA enrichment
  73. 2026-06-16 17:52 UTCEPSS rescore
  74. 2026-06-16 17:24 UTCVendor advisory
  75. 2026-06-16 17:23 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-33843?
CVE-2026-33843 is a critical vulnerability published on May 26, 2026. Authentication bypass using an alternate path or channel in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.
When was CVE-2026-33843 disclosed?
CVE-2026-33843 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33843 actively exploited?
CVE-2026-33843 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33843?
CVE-2026-33843 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.1.
How do I remediate CVE-2026-33843?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33843, 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.

Dependency Blast Radius

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