CVE-2026-47303

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: 0.7%, top 47% 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.

Authentication bypass by assumed-immutable data 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
53%
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-2026-47303

Vendor Advisories for CVE-2026-47303(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
ubuntudotnet10 (10.0.110-10.0.10-0ubuntu1~26.04.1) @ resolute2026-09-18ubuntu
redhatdotnet8.0-0:8.0.130-1.el10_02026-08-24redhat
redhatdotnet8.0-0:8.0.130-1.el9_42026-08-24redhat
redhatdotnet9.0-0:9.0.120-1.el10_02026-08-24redhat
redhatdotnet8.0-0:8.0.130-1.el9_62026-08-24redhat
redhatdotnet9.0-0:9.0.120-1.el9_62026-08-24redhat
redhatdotnet9.0-0:9.0.119-1.el9_82026-07-20redhat
redhatdotnet9.0-0:9.0.119-1.el8_102026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el8_102026-07-20redhat
redhatdotnet10.0-0:10.0.110-1.el8_102026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el9_82026-07-20redhat
redhatdotnet10.0-0:10.0.110-1.el9_82026-07-20redhat
redhatdotnet9.0-0:9.0.119-1.el10_22026-07-20redhat
redhatdotnet10.0-0:10.0.110-1.el10_22026-07-20redhat
redhatdotnet8-0-main-8.0.129-2.1.hum12026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el10_22026-07-20redhat
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(3)

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 / 76× 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 207 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-47303?
CVE-2026-47303 is a high vulnerability published on July 14, 2026. Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-47303 disclosed?
CVE-2026-47303 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-2026-47303 actively exploited?
CVE-2026-47303 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 47.1% of all scored CVEs.
What is the CVSS score of CVE-2026-47303?
CVE-2026-47303 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-47303?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47303, 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-2026-47303

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