CVE-2026-40372

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.0%, top 93% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:microsoft, epss
Elevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 11%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
95.4%
KEV
Not listed

Published

April 21, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Apr 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-2026-40372

Vendor Advisories for CVE-2026-40372(1)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudotnet10 (10.0.107-10.0.7-0ubuntu1~25.10.1) @ questing2026-06-15ubuntu
ubuntudotnet10 (10.0.107-10.0.7-0ubuntu1~26.04.1) @ resolute2026-06-15ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
Microsoft.AspNetCore.DataProtection10.0.0 ... 10.0.6 (7 versions)10.0.7—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 39× 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 165 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-40372?
CVE-2026-40372 is a critical vulnerability published on April 21, 2026. Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
When was CVE-2026-40372 disclosed?
CVE-2026-40372 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40372 actively exploited?
CVE-2026-40372 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40372?
CVE-2026-40372 has a CVSS v4.0 base score of 9.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-40372?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40372, 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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