CVE-2026-21515

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-24. the CNA's CVSS baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.9Exploit: None knownExposed: 0

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

Exposure of sensitive information to an unauthorized actor in Azure IOT Central allows an authorized attacker to elevate privileges over a network.

CVSS v3
9.9
EG Score
9.9(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity99% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

April 24, 2026

Last Modified

August 14, 2026

Advisory Details (1)

Auto-updated Sep 11, 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-2026-21515

Vendor Advisories for CVE-2026-21515(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 5× in last 7d / 30× 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 379 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-21515?
CVE-2026-21515 is a critical vulnerability published on April 24, 2026. Exposure of sensitive information to an unauthorized actor in Azure IOT Central allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-21515 disclosed?
CVE-2026-21515 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21515 actively exploited?
CVE-2026-21515 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.8% of all scored CVEs.
What is the CVSS score of CVE-2026-21515?
CVE-2026-21515 has a CVSS v4.0 base score of 9.9 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-21515?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21515, 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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