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: 11.2%, top 4% 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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 11%CVSS: 9.1Exploit: Elevated riskExposed: 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)
EG Risk
72(Track)
EG Risk 72/100SSVC: 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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
11%
EPSS %ILE
96%
KEV
Not listed

Published

April 21, 2026

Last Modified

August 14, 2026

Advisory Details (1)

Auto-updated Aug 1, 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 5× in last 7d / 80× 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 220 total refreshes for this CVE.

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

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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 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-2026-40372 actively exploited?
CVE-2026-40372 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11% probability of exploitation in the next 30 days, which ranks it in the top 4.4% of all scored CVEs.
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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