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: 0.8%, top 44% 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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.1Exploit: None knownExposed services: Not assessed

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
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

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%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
0.8%
EPSS %ILE
56th
KEV
Not listed

Published

April 21, 2026

Last Modified

September 25, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
Patch available. Sources: microsoft.
microsoftMentions a patch (unverified)

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
Microsoft.AspNetCore.DataProtection10.0.0 ... 10.0.6 (7 versions)
  • 10.0.0 up to 10.0.7: fixed in 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 6× in last 7d / 24× 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 257 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 17:12 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 15:17 UTCEPSS rescore
  6. 2026-10-05 17:43 UTCEPSS rescore
  7. 2026-10-03 14:25 UTCEPSS rescore
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-09-30 15:03 UTCEPSS rescore
  10. 2026-09-27 13:48 UTCEPSS rescore
  11. 2026-09-26 15:58 UTCEPSS rescore
  12. 2026-09-25 17:44 UTCEG score recompute
  13. 2026-09-25 17:44 UTCVendor advisory
  14. 2026-09-21 18:19 UTCOSV refresh
  15. 2026-09-20 20:15 UTCEPSS rescore
  16. 2026-09-18 19:28 UTCEPSS rescore
  17. 2026-09-18 19:28 UTCEPSS rescore
  18. 2026-09-17 19:30 UTCEPSS rescore
  19. 2026-09-16 14:08 UTCEPSS rescore
  20. 2026-09-16 05:15 UTCEPSS rescore
  21. 2026-09-15 03:11 UTCEPSS rescore
  22. 2026-09-12 15:01 UTCEPSS rescore
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 09:37 UTCEPSS rescore
  25. 2026-09-10 09:34 UTCEPSS rescore
Show 75 more
  1. 2026-09-08 22:00 UTCEPSS rescore
  2. 2026-09-07 16:01 UTCEPSS rescore
  3. 2026-09-06 13:47 UTCEPSS rescore
  4. 2026-09-04 05:06 UTCEPSS rescore
  5. 2026-09-02 15:08 UTCOSV refresh
  6. 2026-09-02 14:12 UTCEPSS rescore
  7. 2026-09-01 13:53 UTCEPSS rescore
  8. 2026-09-01 04:39 UTCEPSS rescore
  9. 2026-08-30 19:17 UTCEPSS rescore
  10. 2026-08-30 01:22 UTCEPSS rescore
  11. 2026-08-28 21:41 UTCEPSS rescore
  12. 2026-08-27 14:25 UTCEPSS rescore
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-25 13:49 UTCEPSS rescore
  15. 2026-08-23 00:19 UTCEPSS rescore
  16. 2026-08-21 23:49 UTCEPSS rescore
  17. 2026-08-20 22:55 UTCEPSS rescore
  18. 2026-08-19 17:03 UTCEPSS rescore
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 10:30 UTCVendor advisory
  23. 2026-08-16 06:17 UTCEG score recompute
  24. 2026-08-16 06:17 UTCVendor advisory
  25. 2026-08-16 02:14 UTCEPSS rescore
  26. 2026-08-15 01:30 UTCEPSS rescore
  27. 2026-08-15 01:16 UTCVendor advisory
  28. 2026-08-14 21:03 UTCVendor advisory
  29. 2026-08-14 16:49 UTCVendor advisory
  30. 2026-08-14 12:55 UTCVendor advisory
  31. 2026-08-14 08:41 UTCVendor advisory
  32. 2026-08-14 04:28 UTCEG score recompute
  33. 2026-08-14 04:28 UTCVendor advisory
  34. 2026-08-13 22:00 UTCEPSS rescore
  35. 2026-08-13 08:43 UTCVendor advisory
  36. 2026-08-13 03:06 UTCVendor advisory
  37. 2026-08-12 22:53 UTCVendor advisory
  38. 2026-08-12 18:39 UTCEG score recompute
  39. 2026-08-12 18:39 UTCVendor advisory
  40. 2026-08-12 13:51 UTCEPSS rescore
  41. 2026-08-12 01:19 UTCVendor advisory
  42. 2026-08-11 21:06 UTCVendor advisory
  43. 2026-08-11 16:51 UTCEG score recompute
  44. 2026-08-11 16:51 UTCVendor advisory
  45. 2026-08-11 13:43 UTCEPSS rescore
  46. 2026-08-11 06:38 UTCVendor advisory
  47. 2026-08-11 02:25 UTCEG score recompute
  48. 2026-08-11 02:25 UTCVendor advisory
  49. 2026-08-11 00:00 UTCEPSS rescore
  50. 2026-08-10 09:49 UTCVendor advisory
  51. 2026-08-10 05:36 UTCVendor advisory
  52. 2026-08-10 01:23 UTCVendor advisory
  53. 2026-08-09 21:09 UTCVendor advisory
  54. 2026-08-09 16:56 UTCEG score recompute
  55. 2026-08-09 16:56 UTCVendor advisory
  56. 2026-08-09 13:46 UTCEPSS rescore
  57. 2026-08-09 12:43 UTCVendor advisory
  58. 2026-08-09 07:54 UTCVendor advisory
  59. 2026-08-09 03:40 UTCEG score recompute
  60. 2026-08-09 03:40 UTCVendor advisory
  61. 2026-08-08 16:37 UTCEPSS rescore
  62. 2026-08-08 10:02 UTCVendor advisory
  63. 2026-08-08 05:49 UTCVendor advisory
  64. 2026-08-08 01:36 UTCVendor advisory
  65. 2026-08-07 21:23 UTCVendor advisory
  66. 2026-08-07 17:10 UTCEG score recompute
  67. 2026-08-07 17:10 UTCVendor advisory
  68. 2026-08-07 12:56 UTCVendor advisory
  69. 2026-08-06 21:49 UTCVendor advisory
  70. 2026-08-06 17:26 UTCEG score recompute
  71. 2026-08-06 17:26 UTCVendor advisory
  72. 2026-08-06 13:46 UTCEPSS rescore
  73. 2026-08-06 11:55 UTCVendor advisory
  74. 2026-08-06 07:37 UTCVendor advisory
  75. 2026-08-06 03:23 UTCVendor advisory

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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 on April 21, 2026, with the most recent update on September 25, 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 0.8% probability of exploitation in the next 30 days (56th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-40372?
CVE-2026-40372 has a CVSS base score of 9.1 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-40372?
A fix for CVE-2026-40372 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-40372 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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