CVE-2026-47300

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 57% 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
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

July 14, 2026

Last Modified

September 17, 2026

Advisory Details (1)

Auto-updated Jul 14, 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-2026-47300

Vendor Advisories for CVE-2026-47300(19)

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

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunetstandard-targeting-pack-2.1-8.0 (8.0.129-0ubuntu1~24.04.1) @ noble2026-09-18ubuntu
redhatdotnet9.0-0:9.0.120-1.el9_62026-08-24redhat
redhatdotnet8.0-0:8.0.130-1.el10_02026-08-24redhat
redhatdotnet8.0-0:8.0.130-1.el9_42026-08-24redhat
redhatdotnet8.0-0:8.0.130-1.el9_62026-08-24redhat
redhatdotnet9.0-0:9.0.120-1.el10_02026-08-24redhat
redhatdotnet8-0-main-8.0.129-2.1.hum12026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el8_102026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el9_82026-07-20redhat
redhatdotnet9.0-0:9.0.119-1.el9_82026-07-20redhat
redhatdotnet10.0-0:10.0.110-1.el9_82026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el10_22026-07-20redhat
redhatdotnet10.0-0:10.0.110-1.el10_22026-07-20redhat
redhatdotnet9.0-0:9.0.119-1.el10_22026-07-20redhat
redhatdotnet9.0-0:9.0.119-1.el8_102026-07-20redhat
redhatdotnet10.0-0:10.0.110-1.el8_102026-07-20redhat
redhatdotnet9-0-main-9.0.119-1.hum12026-07-15redhat
redhatdotnet10-0-main-10.0.109-1.hum12026-06-17redhat

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.Authentication.Negotiate8.0.0 ... 8.0.8 (28 versions)8.0.29—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 13× in last 7d / 75× 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 206 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-47300?
CVE-2026-47300 is a high vulnerability published on July 14, 2026. Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-47300 disclosed?
CVE-2026-47300 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47300 actively exploited?
CVE-2026-47300 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 56.5% of all scored CVEs.
What is the CVSS score of CVE-2026-47300?
CVE-2026-47300 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-47300?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47300, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-47300

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